21690407596 has 48 divisors (see below), whose sum is σ = 45131643648. Its totient is φ = 8991201600.

The previous prime is 21690407587. The next prime is 21690407603. The reversal of 21690407596 is 69570409612.

It is a happy number.

It is a super-2 number, since 2×21690407596² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180960 + ... + 275911.

It is an arithmetic number, because the mean of its divisors is an integer number (940242576).

Almost surely, 2^21690407596 is an apocalyptic number.

21690407596 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21690407596 is an abundant number, since it is smaller than the sum of its proper divisors (23441236052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21690407596 is a wasteful number, since it uses less digits than its factorization.

21690407596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456982 (or 456980 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 21690407596 in words is "twenty-one billion, six hundred ninety million, four hundred seven thousand, five hundred ninety-six".