102001212121021 has 2 divisors, whose sum is σ = 102001212121022. Its totient is φ = 102001212121020.

The previous prime is 102001212121009. The next prime is 102001212121079. The reversal of 102001212121021 is 120121212100201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73768344322500 + 28232867798521 = 8588850^2 + 5313461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102001212121021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102001212120986 and 102001212121004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102001212121001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51000606060510 + 51000606060511.

It is an arithmetic number, because the mean of its divisors is an integer number (51000606060511).

Almost surely, 2^{102001212121021} is an apocalyptic number.

It is an amenable number.

102001212121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102001212121021 is an equidigital number, since it uses as much as digits as its factorization.

102001212121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 102001212121021 its reverse (120121212100201), we get a palindrome (222122424221222).

The spelling of 102001212121021 in words is "one hundred two trillion, one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".