21632771 has 2 divisors, whose sum is σ = 21632772. Its totient is φ = 21632770.

The previous prime is 21632731. The next prime is 21632797. The reversal of 21632771 is 17723612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21632771 - 2¹⁸ = 21370627 is a prime.

It is a super-2 number, since 2×21632771² = 935953562276882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21632731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10816385 + 10816386.

It is an arithmetic number, because the mean of its divisors is an integer number (10816386).

Almost surely, 2^21632771 is an apocalyptic number.

21632771 is a deficient number, since it is larger than the sum of its proper divisors (1).

21632771 is an equidigital number, since it uses as much as digits as its factorization.

21632771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 29.

The square root of 21632771 is about 4651.1042774808. The cubic root of 21632771 is about 278.6361009860.

The spelling of 21632771 in words is "twenty-one million, six hundred thirty-two thousand, seven hundred seventy-one".