121299381889 has 4 divisors (see below), whose sum is σ = 138627865024. Its totient is φ = 103970898756.

The previous prime is 121299381809. The next prime is 121299381919. The reversal of 121299381889 is 988183992121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121299381889 - 2⁷ = 121299381761 is a prime.

It is a super-2 number, since 2×121299381889² (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 (121299381809) 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, 8664241557 + ... + 8664241570.

It is an arithmetic number, because the mean of its divisors is an integer number (34656966256).

Almost surely, 2^121299381889 is an apocalyptic number.

It is an amenable number.

121299381889 is a deficient number, since it is larger than the sum of its proper divisors (17328483135).

121299381889 is an equidigital number, since it uses as much as digits as its factorization.

121299381889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17328483134.

The product of its digits is 4478976, while the sum is 61.

The spelling of 121299381889 in words is "one hundred twenty-one billion, two hundred ninety-nine million, three hundred eighty-one thousand, eight hundred eighty-nine".