21257392030 has 16 divisors (see below), whose sum is σ = 43729492320. Its totient is φ = 7288248672.

The previous prime is 21257392027. The next prime is 21257392049. The reversal of 21257392030 is 3029375212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151838445 + ... + 151838584.

It is an arithmetic number, because the mean of its divisors is an integer number (2733093270).

Almost surely, 2^21257392030 is an apocalyptic number.

21257392030 is an abundant number, since it is smaller than the sum of its proper divisors (22472100290).

21257392030 is a wasteful number, since it uses less digits than its factorization.

21257392030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303677043.

The product of its (nonzero) digits is 22680, while the sum is 34.

The spelling of 21257392030 in words is "twenty-one billion, two hundred fifty-seven million, three hundred ninety-two thousand, thirty".