102121091 has 4 divisors (see below), whose sum is σ = 108128232. Its totient is φ = 96113952.

The previous prime is 102121069. The next prime is 102121109. The reversal of 102121091 is 190121201.

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 102121091 - 2⁶ = 102121027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 6007123 = 102121091 / (1 + 0 + 2 + 1 + 2 + 1 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3003545 + ... + 3003578.

It is an arithmetic number, because the mean of its divisors is an integer number (27032058).

Almost surely, 2^102121091 is an apocalyptic number.

102121091 is a deficient number, since it is larger than the sum of its proper divisors (6007141).

102121091 is an equidigital number, since it uses as much as digits as its factorization.

102121091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007140.

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

The square root of 102121091 is about 10105.4980579880. The cubic root of 102121091 is about 467.4176941476.

Adding to 102121091 its reverse (190121201), we get a palindrome (292242292).

The spelling of 102121091 in words is "one hundred two million, one hundred twenty-one thousand, ninety-one".