21210677157 has 16 divisors (see below), whose sum is σ = 28912554432. Its totient is φ = 13827707520.

The previous prime is 21210677153. The next prime is 21210677167. The reversal of 21210677157 is 75177601212.

It is a happy number.

It is not a de Polignac number, because 21210677157 - 2² = 21210677153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210677153) 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 15 ways as a sum of consecutive naturals, for example, 357594 + ... + 412667.

It is an arithmetic number, because the mean of its divisors is an integer number (1807034652).

Almost surely, 2^21210677157 is an apocalyptic number.

It is an amenable number.

21210677157 is a deficient number, since it is larger than the sum of its proper divisors (7701877275).

21210677157 is a wasteful number, since it uses less digits than its factorization.

21210677157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770468.

The product of its (nonzero) digits is 41160, while the sum is 39.

The spelling of 21210677157 in words is "twenty-one billion, two hundred ten million, six hundred seventy-seven thousand, one hundred fifty-seven".