21447045213 has 16 divisors (see below), whose sum is σ = 31198153536. Its totient is φ = 12997187840.

The previous prime is 21447045187. The next prime is 21447045241. The reversal of 21447045213 is 31254074412.

It is a cyclic number.

It is not a de Polignac number, because 21447045213 - 2⁹ = 21447044701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447045253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781045 + ... + 808037.

It is an arithmetic number, because the mean of its divisors is an integer number (1949884596).

Almost surely, 2^21447045213 is an apocalyptic number.

It is an amenable number.

21447045213 is a deficient number, since it is larger than the sum of its proper divisors (9751108323).

21447045213 is a wasteful number, since it uses less digits than its factorization.

21447045213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51084.

The product of its (nonzero) digits is 26880, while the sum is 33.

The spelling of 21447045213 in words is "twenty-one billion, four hundred forty-seven million, forty-five thousand, two hundred thirteen".