21406926652 has 12 divisors (see below), whose sum is σ = 37493322496. Its totient is φ = 10694548800.

The previous prime is 21406926613. The next prime is 21406926661. The reversal of 21406926652 is 25662960412.

It is a junction number, because it is equal to n+sod(n) for n = 21406926599 and 21406926608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2223228 + ... + 2232835.

Almost surely, 2^21406926652 is an apocalyptic number.

It is an amenable number.

21406926652 is a deficient number, since it is larger than the sum of its proper divisors (16086395844).

21406926652 is a wasteful number, since it uses less digits than its factorization.

21406926652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457268 (or 4457266 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 21406926652 in words is "twenty-one billion, four hundred six million, nine hundred twenty-six thousand, six hundred fifty-two".