21876377 has 2 divisors, whose sum is σ = 21876378. Its totient is φ = 21876376.

The previous prime is 21876373. The next prime is 21876389. The reversal of 21876377 is 77367812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14280841 + 7595536 = 3779^2 + 2756^2 .

It is a cyclic number.

It is not a de Polignac number, because 21876377 - 2² = 21876373 is a prime.

It is a super-2 number, since 2×21876377² = 957151741292258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21876373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10938188 + 10938189.

It is an arithmetic number, because the mean of its divisors is an integer number (10938189).

Almost surely, 2^21876377 is an apocalyptic number.

It is an amenable number.

21876377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21876377 is an equidigital number, since it uses as much as digits as its factorization.

21876377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 21876377 is about 4677.2189386429. The cubic root of 21876377 is about 279.6781037198.

The spelling of 21876377 in words is "twenty-one million, eight hundred seventy-six thousand, three hundred seventy-seven".