21331077251 has 16 divisors (see below), whose sum is σ = 23665672800. Its totient is φ = 19062758400.

The previous prime is 21331077221. The next prime is 21331077253. The reversal of 21331077251 is 15277013312.

It is a cyclic number.

It is not a de Polignac number, because 21331077251 - 2¹⁰ = 21331076227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331077253) 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, 1259105 + ... + 1275933.

It is an arithmetic number, because the mean of its divisors is an integer number (1479104550).

Almost surely, 2^21331077251 is an apocalyptic number.

21331077251 is a deficient number, since it is larger than the sum of its proper divisors (2334595549).

21331077251 is a wasteful number, since it uses less digits than its factorization.

21331077251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18790.

The product of its (nonzero) digits is 8820, while the sum is 32.

The spelling of 21331077251 in words is "twenty-one billion, three hundred thirty-one million, seventy-seven thousand, two hundred fifty-one".