21888827 has 2 divisors, whose sum is σ = 21888828. Its totient is φ = 21888826.

The previous prime is 21888787. The next prime is 21888851. The reversal of 21888827 is 72888812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21888827 - 2¹⁴ = 21872443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21885827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944413 + 10944414.

It is an arithmetic number, because the mean of its divisors is an integer number (10944414).

Almost surely, 2^21888827 is an apocalyptic number.

21888827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888827 is an equidigital number, since it uses as much as digits as its factorization.

21888827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 114688, while the sum is 44.

The square root of 21888827 is about 4678.5496684336. The cubic root of 21888827 is about 279.7311492501.

The spelling of 21888827 in words is "twenty-one million, eight hundred eighty-eight thousand, eight hundred twenty-seven".