21157607701 has 16 divisors (see below), whose sum is σ = 22574223360. Its totient is φ = 19787367600.

The previous prime is 21157607677. The next prime is 21157607717. The reversal of 21157607701 is 10770675112.

It is a cyclic number.

It is not a de Polignac number, because 21157607701 - 2³¹ = 19010124053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21157607761) 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, 130626 + ... + 243676.

It is an arithmetic number, because the mean of its divisors is an integer number (1410888960).

Almost surely, 2^21157607701 is an apocalyptic number.

It is an amenable number.

21157607701 is a deficient number, since it is larger than the sum of its proper divisors (1416615659).

21157607701 is a wasteful number, since it uses less digits than its factorization.

21157607701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113256.

The product of its (nonzero) digits is 20580, while the sum is 37.

The spelling of 21157607701 in words is "twenty-one billion, one hundred fifty-seven million, six hundred seven thousand, seven hundred one".