21406023537676 has 24 divisors (see below), whose sum is σ = 37498922314560. Its totient is φ = 10692049880400.

The previous prime is 21406023537671. The next prime is 21406023537683. The reversal of 21406023537676 is 67673532060412.

It is not an unprimeable number, because it can be changed into a prime (21406023537671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20238411 + ... + 21269821.

It is an arithmetic number, because the mean of its divisors is an integer number (1562455096440).

Almost surely, 2^{21406023537676} is an apocalyptic number.

It is an amenable number.

21406023537676 is a deficient number, since it is larger than the sum of its proper divisors (16092898776884).

21406023537676 is a wasteful number, since it uses less digits than its factorization.

21406023537676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036725 (or 1036723 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 52.

The spelling of 21406023537676 in words is "twenty-one trillion, four hundred six billion, twenty-three million, five hundred thirty-seven thousand, six hundred seventy-six".