21445034155245 has 12 divisors (see below), whose sum is σ = 37171392535836. Its totient is φ = 11437351549440.

The previous prime is 21445034155241. The next prime is 21445034155301. The reversal of 21445034155245 is 54255143054412.

21445034155245 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 50 + 3 + 4 + 1 + 552 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6975668040201 + 14469366115044 = 2641149^2 + 3803862^2 .

It is not a de Polignac number, because 21445034155245 - 2² = 21445034155241 is a prime.

It is a super-2 number, since 2×21445034155245² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 476556314561 = 21445034155245 / (2 + 1 + 4 + 4 + 5 + 0 + 3 + 4 + 1 + 5 + 5 + 2 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 21445034155245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445034155241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238278157236 + ... + 238278157325.

It is an arithmetic number, because the mean of its divisors is an integer number (3097616044653).

Almost surely, 2^{21445034155245} is an apocalyptic number.

It is an amenable number.

21445034155245 is a deficient number, since it is larger than the sum of its proper divisors (15726358380591).

21445034155245 is a wasteful number, since it uses less digits than its factorization.

21445034155245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476556314572 (or 476556314569 counting only the distinct ones).

The product of its (nonzero) digits is 1920000, while the sum is 45.

The spelling of 21445034155245 in words is "twenty-one trillion, four hundred forty-five billion, thirty-four million, one hundred fifty-five thousand, two hundred forty-five".