21377201 has 2 divisors, whose sum is σ = 21377202. Its totient is φ = 21377200.

The previous prime is 21377183. The next prime is 21377233. The reversal of 21377201 is 10277312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12967201 + 8410000 = 3601^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 21377201 - 2¹⁴ = 21360817 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21377501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688600 + 10688601.

It is an arithmetic number, because the mean of its divisors is an integer number (10688601).

Almost surely, 2^21377201 is an apocalyptic number.

It is an amenable number.

21377201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21377201 is an equidigital number, since it uses as much as digits as its factorization.

21377201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21377201 is about 4623.5485289980. The cubic root of 21377201 is about 277.5344804705.

The spelling of 21377201 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred one".