21700733121 has 24 divisors (see below), whose sum is σ = 33279876864. Its totient is φ = 13579009920.

The previous prime is 21700733107. The next prime is 21700733177. The reversal of 21700733121 is 12133700712.

It is not a de Polignac number, because 21700733121 - 2¹⁹ = 21700208833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21700733191) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 137085 + ... + 249386.

It is an arithmetic number, because the mean of its divisors is an integer number (1386661536).

Almost surely, 2^21700733121 is an apocalyptic number.

It is an amenable number.

21700733121 is a deficient number, since it is larger than the sum of its proper divisors (11579143743).

21700733121 is a wasteful number, since it uses less digits than its factorization.

21700733121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386861 (or 386858 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The spelling of 21700733121 in words is "twenty-one billion, seven hundred million, seven hundred thirty-three thousand, one hundred twenty-one".