21305852970 has 32 divisors (see below), whose sum is σ = 51175473408. Its totient is φ = 5676957888.

The previous prime is 21305852933. The next prime is 21305852983. The reversal of 21305852970 is 7925850312.

It is a happy 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, 249954 + ... + 324173.

It is an arithmetic number, because the mean of its divisors is an integer number (1599233544).

Almost surely, 2^21305852970 is an apocalyptic number.

21305852970 is an abundant number, since it is smaller than the sum of its proper divisors (29869620438).

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

21305852970 is a wasteful number, since it uses less digits than its factorization.

21305852970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575374.

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 21305852970 in words is "twenty-one billion, three hundred five million, eight hundred fifty-two thousand, nine hundred seventy".