99901836121 has 2 divisors, whose sum is σ = 99901836122. Its totient is φ = 99901836120.

The previous prime is 99901836113. The next prime is 99901836169. The reversal of 99901836121 is 12163810999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99451929600 + 449906521 = 315360^2 + 21211^2 .

It is a cyclic number.

It is not a de Polignac number, because 99901836121 - 2³ = 99901836113 is a prime.

It is not a weakly prime, because it can be changed into another prime (99901836101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49950918060 + 49950918061.

It is an arithmetic number, because the mean of its divisors is an integer number (49950918061).

Almost surely, 2^99901836121 is an apocalyptic number.

It is an amenable number.

99901836121 is a deficient number, since it is larger than the sum of its proper divisors (1).

99901836121 is an equidigital number, since it uses as much as digits as its factorization.

99901836121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 49.

The spelling of 99901836121 in words is "ninety-nine billion, nine hundred one million, eight hundred thirty-six thousand, one hundred twenty-one".