102021211111979 has 2 divisors, whose sum is σ = 102021211111980. Its totient is φ = 102021211111978.

The previous prime is 102021211111969. The next prime is 102021211112017. The reversal of 102021211111979 is 979111112120201.

It is a happy number.

It is an a-pointer prime, because the next prime (102021211112017) can be obtained adding 102021211111979 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102021211111979 - 2¹² = 102021211107883 is a prime.

It is not a weakly prime, because it can be changed into another prime (102021211111949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010605555989 + 51010605555990.

It is an arithmetic number, because the mean of its divisors is an integer number (51010605555990).

Almost surely, 2^{102021211111979} is an apocalyptic number.

102021211111979 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021211111979 is an equidigital number, since it uses as much as digits as its factorization.

102021211111979 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 38.

The spelling of 102021211111979 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, nine hundred seventy-nine".