21726609996 has 72 divisors (see below), whose sum is σ = 63508574640. Its totient is φ = 5730092928.

The previous prime is 21726609937. The next prime is 21726610013. The reversal of 21726609996 is 69990662712.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1413511 + ... + 1428798.

Almost surely, 2^21726609996 is an apocalyptic number.

21726609996 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21726609996 is an abundant number, since it is smaller than the sum of its proper divisors (41781964644).

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

21726609996 is a wasteful number, since it uses less digits than its factorization.

21726609996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842343 (or 2842334 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 57.

The spelling of 21726609996 in words is "twenty-one billion, seven hundred twenty-six million, six hundred nine thousand, nine hundred ninety-six".