21237540770 has 32 divisors (see below), whose sum is σ = 38726899200. Its totient is φ = 8384141376.

The previous prime is 21237540763. The next prime is 21237540773. The reversal of 21237540770 is 7704573212.

It is not an unprimeable number, because it can be changed into a prime (21237540773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3162176 + ... + 3168884.

It is an arithmetic number, because the mean of its divisors is an integer number (1210215600).

Almost surely, 2^21237540770 is an apocalyptic number.

21237540770 is a deficient number, since it is larger than the sum of its proper divisors (17489358430).

21237540770 is a wasteful number, since it uses less digits than its factorization.

21237540770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802.

The product of its (nonzero) digits is 82320, while the sum is 38.

The spelling of 21237540770 in words is "twenty-one billion, two hundred thirty-seven million, five hundred forty thousand, seven hundred seventy".