21227099 has 2 divisors, whose sum is σ = 21227100. Its totient is φ = 21227098.

The previous prime is 21227081. The next prime is 21227111. The reversal of 21227099 is 99072212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21227099 - 2¹⁶ = 21161563 is a prime.

It is not a weakly prime, because it can be changed into another prime (21227399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613549 + 10613550.

It is an arithmetic number, because the mean of its divisors is an integer number (10613550).

Almost surely, 2^21227099 is an apocalyptic number.

21227099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227099 is an equidigital number, since it uses as much as digits as its factorization.

21227099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 21227099 is about 4607.2875968405. The cubic root of 21227099 is about 276.8833761205.

The spelling of 21227099 in words is "twenty-one million, two hundred twenty-seven thousand, ninety-nine".