21920299 has 2 divisors, whose sum is σ = 21920300. Its totient is φ = 21920298.

The previous prime is 21920291. The next prime is 21920321. The reversal of 21920299 is 99202912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21920299 - 2³ = 21920291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21920291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10960149 + 10960150.

It is an arithmetic number, because the mean of its divisors is an integer number (10960150).

Almost surely, 2^21920299 is an apocalyptic number.

21920299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21920299 is an equidigital number, since it uses as much as digits as its factorization.

21920299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 21920299 is about 4681.9118957964. The cubic root of 21920299 is about 279.8651519043.

The spelling of 21920299 in words is "twenty-one million, nine hundred twenty thousand, two hundred ninety-nine".