21245106762 has 64 divisors (see below), whose sum is σ = 53742597120. Its totient is φ = 6157998000.

The previous prime is 21245106733. The next prime is 21245106787. The reversal of 21245106762 is 26760154212.

It is a happy number.

21245106762 is a `hidden beast` number, since 2 + 1 + 24 + 510 + 67 + 62 = 666.

It is a super-2 number, since 2×21245106762² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 763864 + ... + 791187.

It is an arithmetic number, because the mean of its divisors is an integer number (839728080).

Almost surely, 2^21245106762 is an apocalyptic number.

21245106762 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21245106762 is an abundant number, since it is smaller than the sum of its proper divisors (32497490358).

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

21245106762 is a wasteful number, since it uses less digits than its factorization.

21245106762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555096 (or 1555090 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 21245106762 in words is "twenty-one billion, two hundred forty-five million, one hundred six thousand, seven hundred sixty-two".