102001210021021 has 2 divisors, whose sum is σ = 102001210021022. Its totient is φ = 102001210021020.

The previous prime is 102001210020979. The next prime is 102001210021033. The reversal of 102001210021021 is 120120012100201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64870943062500 + 37130266958521 = 8054250^2 + 6093461^2 .

It is a cyclic number.

It is not a de Polignac number, because 102001210021021 - 2¹¹ = 102001210018973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102001210020992 and 102001210021010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102001210027021) 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, 51000605010510 + 51000605010511.

It is an arithmetic number, because the mean of its divisors is an integer number (51000605010511).

Almost surely, 2^{102001210021021} is an apocalyptic number.

It is an amenable number.

102001210021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102001210021021 is an equidigital number, since it uses as much as digits as its factorization.

102001210021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102001210021021 its reverse (120120012100201), we get a palindrome (222121222121222).

The spelling of 102001210021021 in words is "one hundred two trillion, one billion, two hundred ten million, twenty-one thousand, twenty-one".