21210926877 has 48 divisors (see below), whose sum is σ = 37441827072. Its totient is φ = 11294553600.

The previous prime is 21210926873. The next prime is 21210926909. The reversal of 21210926877 is 77862901212.

It is a happy number.

21210926877 is a `hidden beast` number, since 212 + 109 + 268 + 77 = 666.

It is not a de Polignac number, because 21210926877 - 2² = 21210926873 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210926873) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10128 + ... + 206214.

It is an arithmetic number, because the mean of its divisors is an integer number (780038064).

Almost surely, 2^21210926877 is an apocalyptic number.

It is an amenable number.

21210926877 is a deficient number, since it is larger than the sum of its proper divisors (16230900195).

21210926877 is a wasteful number, since it uses less digits than its factorization.

21210926877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196218 (or 196215 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 21210926877 in words is "twenty-one billion, two hundred ten million, nine hundred twenty-six thousand, eight hundred seventy-seven".