121252200491 has 4 divisors (see below), whose sum is σ = 123832034592. Its totient is φ = 118672366392.

The previous prime is 121252200479. The next prime is 121252200521. The reversal of 121252200491 is 194002252121.

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 121252200491 - 2⁶ = 121252200427 is a prime.

It is a super-2 number, since 2×121252200491² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121252200401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1289916980 + ... + 1289917073.

It is an arithmetic number, because the mean of its divisors is an integer number (30958008648).

Almost surely, 2^121252200491 is an apocalyptic number.

121252200491 is a deficient number, since it is larger than the sum of its proper divisors (2579834101).

121252200491 is an equidigital number, since it uses as much as digits as its factorization.

121252200491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579834100.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 121252200491 in words is "one hundred twenty-one billion, two hundred fifty-two million, two hundred thousand, four hundred ninety-one".