21157607702 has 48 divisors (see below), whose sum is σ = 40715619840. Its totient is φ = 8067805680.

The previous prime is 21157607677. The next prime is 21157607717. The reversal of 21157607702 is 20770675112.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 53252 + ... + 212487.

It is an arithmetic number, because the mean of its divisors is an integer number (848242080).

Almost surely, 2^21157607702 is an apocalyptic number.

21157607702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21157607702 is a deficient number, since it is larger than the sum of its proper divisors (19558012138).

21157607702 is a wasteful number, since it uses less digits than its factorization.

21157607702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265817 (or 265806 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 38.

The spelling of 21157607702 in words is "twenty-one billion, one hundred fifty-seven million, six hundred seven thousand, seven hundred two".