9000021157 has 2 divisors, whose sum is σ = 9000021158. Its totient is φ = 9000021156.

The previous prime is 9000021101. The next prime is 9000021169. The reversal of 9000021157 is 7511200009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8956540321 + 43480836 = 94639^2 + 6594^2 .

It is a cyclic number.

It is not a de Polignac number, because 9000021157 - 2²³ = 8991632549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9000021757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500010578 + 4500010579.

It is an arithmetic number, because the mean of its divisors is an integer number (4500010579).

Almost surely, 2^9000021157 is an apocalyptic number.

It is an amenable number.

9000021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

9000021157 is an equidigital number, since it uses as much as digits as its factorization.

9000021157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 9000021157 is about 94868.4413121666. The cubic root of 9000021157 is about 2080.0854529889.

The spelling of 9000021157 in words is "nine billion, twenty-one thousand, one hundred fifty-seven".