121933931 has 4 divisors (see below), whose sum is σ = 139353072. Its totient is φ = 104514792.

The previous prime is 121933921. The next prime is 121933949. The reversal of 121933931 is 139339121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139339121 = 103 ⋅1352807.

It is a cyclic number.

It is not a de Polignac number, because 121933931 - 2¹⁸ = 121671787 is a prime.

It is a super-2 number, since 2×121933931² = 29735767058225522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121933921) 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, 8709560 + ... + 8709573.

It is an arithmetic number, because the mean of its divisors is an integer number (34838268).

Almost surely, 2^121933931 is an apocalyptic number.

121933931 is a deficient number, since it is larger than the sum of its proper divisors (17419141).

121933931 is an equidigital number, since it uses as much as digits as its factorization.

121933931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17419140.

The product of its digits is 4374, while the sum is 32.

The square root of 121933931 is about 11042.3698090582. The cubic root of 121933931 is about 495.8780199413.

The spelling of 121933931 in words is "one hundred twenty-one million, nine hundred thirty-three thousand, nine hundred thirty-one".