121399533 has 16 divisors (see below), whose sum is σ = 190431360. Its totient is φ = 76171968.

The previous prime is 121399519. The next prime is 121399547. The reversal of 121399533 is 335993121.

It is an interprime number because it is at equal distance from previous prime (121399519) and next prime (121399547).

It is not a de Polignac number, because 121399533 - 2⁵ = 121399501 is a prime.

It is a super-2 number, since 2×121399533² = 29475693225236178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121399573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131785 + ... + 132702.

It is an arithmetic number, because the mean of its divisors is an integer number (11901960).

Almost surely, 2^121399533 is an apocalyptic number.

It is an amenable number.

121399533 is a deficient number, since it is larger than the sum of its proper divisors (69031827).

121399533 is a wasteful number, since it uses less digits than its factorization.

121399533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264513 (or 264507 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 121399533 is about 11018.1456243780. The cubic root of 121399533 is about 495.1525333412.

The spelling of 121399533 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, five hundred thirty-three".