21487427694 has 24 divisors (see below), whose sum is σ = 46764873792. Its totient is φ = 7130355840.

The previous prime is 21487427683. The next prime is 21487427737. The reversal of 21487427694 is 49672478412.

21487427694 is a `hidden beast` number, since 2 + 1 + 487 + 4 + 2 + 76 + 94 = 666.

21487427694 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21487427694.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2672547 + ... + 2680574.

It is an arithmetic number, because the mean of its divisors is an integer number (1948536408).

Almost surely, 2^21487427694 is an apocalyptic number.

21487427694 is an abundant number, since it is smaller than the sum of its proper divisors (25277446098).

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

21487427694 is a wasteful number, since it uses less digits than its factorization.

21487427694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353352 (or 5353349 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 21487427694 in words is "twenty-one billion, four hundred eighty-seven million, four hundred twenty-seven thousand, six hundred ninety-four".