21144553245 has 48 divisors (see below), whose sum is σ = 37094803200. Its totient is φ = 11140826112.

The previous prime is 21144553201. The next prime is 21144553247. The reversal of 21144553245 is 54235544112.

21144553245 is a `hidden beast` number, since 2 + 114 + 4 + 5 + 532 + 4 + 5 = 666.

It is not a de Polignac number, because 21144553245 - 2⁷ = 21144553117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144553247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2610592 + ... + 2618678.

It is an arithmetic number, because the mean of its divisors is an integer number (772808400).

Almost surely, 2^21144553245 is an apocalyptic number.

It is an amenable number.

21144553245 is a deficient number, since it is larger than the sum of its proper divisors (15950249955).

21144553245 is a wasteful number, since it uses less digits than its factorization.

21144553245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8794 (or 8791 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The spelling of 21144553245 in words is "twenty-one billion, one hundred forty-four million, five hundred fifty-three thousand, two hundred forty-five".