21450057902 has 32 divisors (see below), whose sum is σ = 39829067712. Its totient is φ = 8436674304.

The previous prime is 21450057851. The next prime is 21450057913. The reversal of 21450057902 is 20975005412.

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, 309143 + ... + 372114.

It is an arithmetic number, because the mean of its divisors is an integer number (1244658366).

Almost surely, 2^21450057902 is an apocalyptic number.

21450057902 is a deficient number, since it is larger than the sum of its proper divisors (18379009810).

21450057902 is a wasteful number, since it uses less digits than its factorization.

21450057902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681452.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 21450057902 in words is "twenty-one billion, four hundred fifty million, fifty-seven thousand, nine hundred two".