21289690570 has 16 divisors (see below), whose sum is σ = 40338361440. Its totient is φ = 8067672144.

The previous prime is 21289690553. The next prime is 21289690571. The reversal of 21289690570 is 7509698212.

It is not an unprimeable number, because it can be changed into a prime (21289690571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56025312 + ... + 56025691.

It is an arithmetic number, because the mean of its divisors is an integer number (2521147590).

Almost surely, 2^21289690570 is an apocalyptic number.

21289690570 is a deficient number, since it is larger than the sum of its proper divisors (19048670870).

21289690570 is a wasteful number, since it uses less digits than its factorization.

21289690570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112051029.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 21289690570 in words is "twenty-one billion, two hundred eighty-nine million, six hundred ninety thousand, five hundred seventy".