21275677 has 2 divisors, whose sum is σ = 21275678. Its totient is φ = 21275676.

The previous prime is 21275671. The next prime is 21275693. The reversal of 21275677 is 77657212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16208676 + 5067001 = 4026^2 + 2251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21275677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21275671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637838 + 10637839.

It is an arithmetic number, because the mean of its divisors is an integer number (10637839).

Almost surely, 2^21275677 is an apocalyptic number.

It is an amenable number.

21275677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21275677 is an equidigital number, since it uses as much as digits as its factorization.

21275677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41160, while the sum is 37.

The square root of 21275677 is about 4612.5564495191. The cubic root of 21275677 is about 277.0944301333.

It can be divided in two parts, 21275 and 677, that added together give a cube (21952 = 28³).

The spelling of 21275677 in words is "twenty-one million, two hundred seventy-five thousand, six hundred seventy-seven".