102121011201221 has 2 divisors, whose sum is σ = 102121011201222. Its totient is φ = 102121011201220.

The previous prime is 102121011201137. The next prime is 102121011201227. The reversal of 102121011201221 is 122102110121201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71466075045121 + 30654936156100 = 8453761^2 + 5536690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102121011201221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102121011201221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102121011201227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060505600610 + 51060505600611.

It is an arithmetic number, because the mean of its divisors is an integer number (51060505600611).

Almost surely, 2^{102121011201221} is an apocalyptic number.

It is an amenable number.

102121011201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121011201221 is an equidigital number, since it uses as much as digits as its factorization.

102121011201221 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 17.

Adding to 102121011201221 its reverse (122102110121201), we get a palindrome (224223121322422).

The spelling of 102121011201221 in words is "one hundred two trillion, one hundred twenty-one billion, eleven million, two hundred one thousand, two hundred twenty-one".