210100012021 has 2 divisors, whose sum is σ = 210100012022. Its totient is φ = 210100012020.

The previous prime is 210100011983. The next prime is 210100012051. The reversal of 210100012021 is 120210001012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209828124900 + 271887121 = 458070^2 + 16489^2 .

It is a cyclic number.

It is not a de Polignac number, because 210100012021 - 2³³ = 201510077429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210100011989 and 210100012007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210100012051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050006010 + 105050006011.

It is an arithmetic number, because the mean of its divisors is an integer number (105050006011).

Almost surely, 2^210100012021 is an apocalyptic number.

It is an amenable number.

210100012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210100012021 is an equidigital number, since it uses as much as digits as its factorization.

210100012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210100012021 its reverse (120210001012), we get a palindrome (330310013033).

The spelling of 210100012021 in words is "two hundred ten billion, one hundred million, twelve thousand, twenty-one".