102021211202021 has 2 divisors, whose sum is σ = 102021211202022. Its totient is φ = 102021211202020.

The previous prime is 102021211201991. The next prime is 102021211202087. The reversal of 102021211202021 is 120202112120201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57416778592996 + 44604432609025 = 7577386^2 + 6678655^2 .

It is a cyclic number.

It is not a de Polignac number, because 102021211202021 - 2³⁴ = 102004031332837 is a prime.

It is a super-4 number, since 4×102021211202021⁴ (a number of 57 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021211202221) 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, 51010605601010 + 51010605601011.

It is an arithmetic number, because the mean of its divisors is an integer number (51010605601011).

Almost surely, 2^{102021211202021} is an apocalyptic number.

It is an amenable number.

102021211202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021211202021 is an equidigital number, since it uses as much as digits as its factorization.

102021211202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102021211202021 its reverse (120202112120201), we get a palindrome (222223323322222).

The spelling of 102021211202021 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, two hundred two thousand, twenty-one".