21487069292 has 48 divisors (see below), whose sum is σ = 42295592640. Its totient is φ = 9476932608.

The previous prime is 21487069283. The next prime is 21487069297. The reversal of 21487069292 is 29296078412.

It is a self number, because there is not a number n which added to its sum of digits gives 21487069292.

It is not an unprimeable number, because it can be changed into a prime (21487069297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342328 + ... + 1358240.

It is an arithmetic number, because the mean of its divisors is an integer number (881158180).

Almost surely, 2^21487069292 is an apocalyptic number.

It is an amenable number.

21487069292 is a deficient number, since it is larger than the sum of its proper divisors (20808523348).

21487069292 is a wasteful number, since it uses less digits than its factorization.

21487069292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17082 (or 17080 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 21487069292 in words is "twenty-one billion, four hundred eighty-seven million, sixty-nine thousand, two hundred ninety-two".