21877253 has 2 divisors, whose sum is σ = 21877254. Its totient is φ = 21877252.

The previous prime is 21877241. The next prime is 21877279. The reversal of 21877253 is 35277812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11847364 + 10029889 = 3442^2 + 3167^2 .

It is a cyclic number.

It is not a de Polignac number, because 21877253 - 2⁸ = 21876997 is a prime.

It is a super-2 number, since 2×21877253² = 957228397652018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21870253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10938626 + 10938627.

It is an arithmetic number, because the mean of its divisors is an integer number (10938627).

Almost surely, 2^21877253 is an apocalyptic number.

It is an amenable number.

21877253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21877253 is an equidigital number, since it uses as much as digits as its factorization.

21877253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 35.

The square root of 21877253 is about 4677.3125830973. The cubic root of 21877253 is about 279.6818367381.

The spelling of 21877253 in words is "twenty-one million, eight hundred seventy-seven thousand, two hundred fifty-three".