2120101010021 has 2 divisors, whose sum is σ = 2120101010022. Its totient is φ = 2120101010020.

The previous prime is 2120101009937. The next prime is 2120101010039. The reversal of 2120101010021 is 1200101010212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1253535508996 + 866565501025 = 1119614^2 + 930895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120101010021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120101009984 and 2120101010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120101010821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060050505010 + 1060050505011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060050505011).

Almost surely, 2^{2120101010021} is an apocalyptic number.

It is an amenable number.

2120101010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120101010021 is an equidigital number, since it uses as much as digits as its factorization.

2120101010021 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 11.

Adding to 2120101010021 its reverse (1200101010212), we get a palindrome (3320202020233).

The spelling of 2120101010021 in words is "two trillion, one hundred twenty billion, one hundred one million, ten thousand, twenty-one".