102021121997 has 2 divisors, whose sum is σ = 102021121998. Its totient is φ = 102021121996.

The previous prime is 102021121957. The next prime is 102021122017. The reversal of 102021121997 is 799121120201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74482051396 + 27539070601 = 272914^2 + 165949^2 .

It is a cyclic number.

It is not a de Polignac number, because 102021121997 - 2²⁴ = 102004344781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021121957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010560998 + 51010560999.

It is an arithmetic number, because the mean of its divisors is an integer number (51010560999).

Almost surely, 2^102021121997 is an apocalyptic number.

It is an amenable number.

102021121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021121997 is an equidigital number, since it uses as much as digits as its factorization.

102021121997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 102021121997 in words is "one hundred two billion, twenty-one million, one hundred twenty-one thousand, nine hundred ninety-seven".