22129999 has 2 divisors, whose sum is σ = 22130000. Its totient is φ = 22129998.

The previous prime is 22129981. The next prime is 22130029. The reversal of 22129999 is 99992122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22129999 - 2⁵ = 22129967 is a prime.

22129999 is a modest number, since divided by 9999 gives 2212 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22129799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11064999 + 11065000.

It is an arithmetic number, because the mean of its divisors is an integer number (11065000).

Almost surely, 2^22129999 is an apocalyptic number.

22129999 is a deficient number, since it is larger than the sum of its proper divisors (1).

22129999 is an equidigital number, since it uses as much as digits as its factorization.

22129999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 43.

The square root of 22129999 is about 4704.2532882488. The cubic root of 22129999 is about 280.7547621204.

The spelling of 22129999 in words is "twenty-two million, one hundred twenty-nine thousand, nine hundred ninety-nine".