102021219997 has 2 divisors, whose sum is σ = 102021219998. Its totient is φ = 102021219996.

The previous prime is 102021219959. The next prime is 102021220031. The reversal of 102021219997 is 799912120201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95548373881 + 6472846116 = 309109^2 + 80454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102021219997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021219947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010609998 + 51010609999.

It is an arithmetic number, because the mean of its divisors is an integer number (51010609999).

Almost surely, 2^102021219997 is an apocalyptic number.

It is an amenable number.

102021219997 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021219997 is an equidigital number, since it uses as much as digits as its factorization.

102021219997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 102021219997 in words is "one hundred two billion, twenty-one million, two hundred nineteen thousand, nine hundred ninety-seven".