21096877 has 2 divisors, whose sum is σ = 21096878. Its totient is φ = 21096876.

The previous prime is 21096839. The next prime is 21096883. The reversal of 21096877 is 77869012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 3632836 = 4179^2 + 1906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21096877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21096077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548438 + 10548439.

It is an arithmetic number, because the mean of its divisors is an integer number (10548439).

Almost surely, 2^21096877 is an apocalyptic number.

It is an amenable number.

21096877 is a deficient number, since it is larger than the sum of its proper divisors (1).

21096877 is an equidigital number, since it uses as much as digits as its factorization.

21096877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 21096877 is about 4593.1336797441. The cubic root of 21096877 is about 276.3160150170.

The spelling of 21096877 in words is "twenty-one million, ninety-six thousand, eight hundred seventy-seven".