21293966490 has 32 divisors (see below), whose sum is σ = 53327500416. Its totient is φ = 5431504320.

The previous prime is 21293966431. The next prime is 21293966521. The reversal of 21293966490 is 9466939212.

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, 15429721 + ... + 15431100.

It is an arithmetic number, because the mean of its divisors is an integer number (1666484388).

Almost surely, 2^21293966490 is an apocalyptic number.

21293966490 is an abundant number, since it is smaller than the sum of its proper divisors (32033533926).

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

21293966490 is a wasteful number, since it uses less digits than its factorization.

21293966490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30860854.

The product of its (nonzero) digits is 1259712, while the sum is 51.

The spelling of 21293966490 in words is "twenty-one billion, two hundred ninety-three million, nine hundred sixty-six thousand, four hundred ninety".