901110202021 has 2 divisors, whose sum is σ = 901110202022. Its totient is φ = 901110202020.

The previous prime is 901110202019. The next prime is 901110202033. The reversal of 901110202021 is 120202011109.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900526979521 + 583222500 = 948961^2 + 24150^2 .

It is an emirp because it is prime and its reverse (120202011109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 901110202021 - 2¹ = 901110202019 is a prime.

Together with 901110202019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 901110202021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901110202001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450555101010 + 450555101011.

It is an arithmetic number, because the mean of its divisors is an integer number (450555101011).

Almost surely, 2^901110202021 is an apocalyptic number.

It is an amenable number.

901110202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

901110202021 is an equidigital number, since it uses as much as digits as its factorization.

901110202021 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 901110202021 in words is "nine hundred one billion, one hundred ten million, two hundred two thousand, twenty-one".