121153500 has 288 divisors, whose sum is σ = 437236800. Its totient is φ = 27993600.

The previous prime is 121153493. The next prime is 121153507. The reversal of 121153500 is 5351121.

121153500 is a `hidden beast` number, since 12 + 1 + 153 + 500 = 666.

It is an interprime number because it is at equal distance from previous prime (121153493) and next prime (121153507).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121153507) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1111446 + ... + 1111554.

Almost surely, 2^121153500 is an apocalyptic number.

121153500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121153500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218618400).

121153500 is an abundant number, since it is smaller than the sum of its proper divisors (316083300).

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

121153500 is a wasteful number, since it uses less digits than its factorization.

121153500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 121153500 is about 11006.9750612964. The cubic root of 121153500 is about 494.8178086773.

The spelling of 121153500 in words is "one hundred twenty-one million, one hundred fifty-three thousand, five hundred".