102021911 has 2 divisors, whose sum is σ = 102021912. Its totient is φ = 102021910.

The previous prime is 102021893. The next prime is 102021919. The reversal of 102021911 is 119120201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102021911 - 2⁶ = 102021847 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102021911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010955 + 51010956.

It is an arithmetic number, because the mean of its divisors is an integer number (51010956).

Almost surely, 2^102021911 is an apocalyptic number.

102021911 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021911 is an equidigital number, since it uses as much as digits as its factorization.

102021911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 102021911 is about 10100.5896362539. The cubic root of 102021911 is about 467.2663264516.

The spelling of 102021911 in words is "one hundred two million, twenty-one thousand, nine hundred eleven".