21523033967 has 6 divisors (see below), whose sum is σ = 21592559424. Its totient is φ = 21453731660.

The previous prime is 21523033963. The next prime is 21523033979. The reversal of 21523033967 is 76933032512.

It is not a de Polignac number, because 21523033967 - 2² = 21523033963 is a prime.

It is a super-2 number, since 2×21523033967² (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 (21523033963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14543 + ... + 207984.

It is an arithmetic number, because the mean of its divisors is an integer number (3598759904).

Almost surely, 2^21523033967 is an apocalyptic number.

21523033967 is a deficient number, since it is larger than the sum of its proper divisors (69525457).

21523033967 is an frugal number, since it uses more digits than its factorization.

21523033967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223149 (or 222838 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 41.

The spelling of 21523033967 in words is "twenty-one billion, five hundred twenty-three million, thirty-three thousand, nine hundred sixty-seven".