102121120000091 has 4 divisors (see below), whose sum is σ = 102143143105872. Its totient is φ = 102099096894312.

The previous prime is 102121120000007. The next prime is 102121120000103. The reversal of 102121120000091 is 190000021121201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102121120000091 - 2¹⁸ = 102121119737947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102121120000391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11011545935 + ... + 11011555208.

It is an arithmetic number, because the mean of its divisors is an integer number (25535785776468).

Almost surely, 2^{102121120000091} is an apocalyptic number.

102121120000091 is a deficient number, since it is larger than the sum of its proper divisors (22023105781).

102121120000091 is an equidigital number, since it uses as much as digits as its factorization.

102121120000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22023105780.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 102121120000091 its reverse (190000021121201), we get a palindrome (292121141121292).

The spelling of 102121120000091 in words is "one hundred two trillion, one hundred twenty-one billion, one hundred twenty million, ninety-one", and thus it is an aban number.