121533210 has 40 divisors (see below), whose sum is σ = 326791476. Its totient is φ = 32408640.

The previous prime is 121533193. The next prime is 121533239. The reversal of 121533210 is 12335121.

121533210 is a `hidden beast` number, since 121 + 533 + 2 + 10 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 119968209 + 1565001 = 10953^2 + 1251^2 .

It is a super-2 number, since 2×121533210² = 29540642265808200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74211 + ... + 75830.

Almost surely, 2^121533210 is an apocalyptic number.

121533210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121533210 is an abundant number, since it is smaller than the sum of its proper divisors (205258266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121533210 is a wasteful number, since it uses less digits than its factorization.

121533210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150060 (or 150051 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 121533210 is about 11024.2101757904. The cubic root of 121533210 is about 495.3342095624.

Adding to 121533210 its reverse (12335121), we get a palindrome (133868331).

The spelling of 121533210 in words is "one hundred twenty-one million, five hundred thirty-three thousand, two hundred ten".