90021211201 has 2 divisors, whose sum is σ = 90021211202. Its totient is φ = 90021211200.

The previous prime is 90021211153. The next prime is 90021211229. The reversal of 90021211201 is 10211212009.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66757640625 + 23263570576 = 258375^2 + 152524^2 .

It is a cyclic number.

It is not a de Polignac number, because 90021211201 - 2⁷ = 90021211073 is a prime.

It is not a weakly prime, because it can be changed into another prime (90021211601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45010605600 + 45010605601.

It is an arithmetic number, because the mean of its divisors is an integer number (45010605601).

Almost surely, 2^90021211201 is an apocalyptic number.

It is an amenable number.

90021211201 is a deficient number, since it is larger than the sum of its proper divisors (1).

90021211201 is an equidigital number, since it uses as much as digits as its factorization.

90021211201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 90021211201 in words is "ninety billion, twenty-one million, two hundred eleven thousand, two hundred one".