900111011110021 has 2 divisors, whose sum is σ = 900111011110022. Its totient is φ = 900111011110020.

The previous prime is 900111011110013. The next prime is 900111011110049. The reversal of 900111011110021 is 120011110111009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 892580514679396 + 7530496430625 = 29876086^2 + 2744175^2 .

It is a cyclic number.

It is not a de Polignac number, because 900111011110021 - 2³ = 900111011110013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900111011110321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450055505555010 + 450055505555011.

It is an arithmetic number, because the mean of its divisors is an integer number (450055505555011).

Almost surely, 2^{900111011110021} is an apocalyptic number.

It is an amenable number.

900111011110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

900111011110021 is an equidigital number, since it uses as much as digits as its factorization.

900111011110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 19.

The spelling of 900111011110021 in words is "nine hundred trillion, one hundred eleven billion, eleven million, one hundred ten thousand, twenty-one".