21292099 has 2 divisors, whose sum is σ = 21292100. Its totient is φ = 21292098.

The previous prime is 21292091. The next prime is 21292147. The reversal of 21292099 is 99029212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21292099 - 2³ = 21292091 is a prime.

It is a super-3 number, since 3×21292099³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21292091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646049 + 10646050.

It is an arithmetic number, because the mean of its divisors is an integer number (10646050).

Almost surely, 2^21292099 is an apocalyptic number.

21292099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21292099 is an equidigital number, since it uses as much as digits as its factorization.

21292099 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 21292099 is about 4614.3362469590. The cubic root of 21292099 is about 277.1657051774.

The spelling of 21292099 in words is "twenty-one million, two hundred ninety-two thousand, ninety-nine".