21249906470 has 32 divisors (see below), whose sum is σ = 43360138080. Its totient is φ = 7433164800.

The previous prime is 21249906467. The next prime is 21249906493. The reversal of 21249906470 is 7460994212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4299131 + ... + 4304070.

It is an arithmetic number, because the mean of its divisors is an integer number (1355004315).

Almost surely, 2^21249906470 is an apocalyptic number.

21249906470 is an abundant number, since it is smaller than the sum of its proper divisors (22110231610).

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

21249906470 is a wasteful number, since it uses less digits than its factorization.

21249906470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8603240.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 21249906470 in words is "twenty-one billion, two hundred forty-nine million, nine hundred six thousand, four hundred seventy".