21070884431 has 16 divisors (see below), whose sum is σ = 21897670848. Its totient is φ = 20259072000.

The previous prime is 21070884427. The next prime is 21070884493. The reversal of 21070884431 is 13448807012.

It is a cyclic number.

It is not a de Polignac number, because 21070884431 - 2² = 21070884427 is a prime.

It is a super-2 number, since 2×21070884431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070881431) 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, 1068521 + ... + 1088061.

It is an arithmetic number, because the mean of its divisors is an integer number (1368604428).

Almost surely, 2^21070884431 is an apocalyptic number.

21070884431 is a deficient number, since it is larger than the sum of its proper divisors (826786417).

21070884431 is a wasteful number, since it uses less digits than its factorization.

21070884431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19922.

The product of its (nonzero) digits is 43008, while the sum is 38.

The spelling of 21070884431 in words is "twenty-one billion, seventy million, eight hundred eighty-four thousand, four hundred thirty-one".