75901020010021 has 2 divisors, whose sum is σ = 75901020010022. Its totient is φ = 75901020010020.

The previous prime is 75901020010007. The next prime is 75901020010069. The reversal of 75901020010021 is 12001002010957.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56832208773796 + 19068811236225 = 7538714^2 + 4366785^2 .

It is an emirp because it is prime and its reverse (12001002010957) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75901020010021 - 2⁹ = 75901020009509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75901020011021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37950510005010 + 37950510005011.

It is an arithmetic number, because the mean of its divisors is an integer number (37950510005011).

Almost surely, 2^{75901020010021} is an apocalyptic number.

It is an amenable number.

75901020010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

75901020010021 is an equidigital number, since it uses as much as digits as its factorization.

75901020010021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

Adding to 75901020010021 its reverse (12001002010957), we get a palindrome (87902022020978).

The spelling of 75901020010021 in words is "seventy-five trillion, nine hundred one billion, twenty million, ten thousand, twenty-one".