121136540 has 24 divisors (see below), whose sum is σ = 290728032. Its totient is φ = 41532480.

The previous prime is 121136489. The next prime is 121136551. The reversal of 121136540 is 45631121.

It is a super-2 number, since 2×121136540² = 29348122646343200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432491 + ... + 432770.

It is an arithmetic number, because the mean of its divisors is an integer number (12113668).

Almost surely, 2^121136540 is an apocalyptic number.

121136540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121136540 is an abundant number, since it is smaller than the sum of its proper divisors (169591492).

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

121136540 is a wasteful number, since it uses less digits than its factorization.

121136540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865277 (or 865275 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 121136540 is about 11006.2046137622. The cubic root of 121136540 is about 494.7947181305.

Adding to 121136540 its reverse (45631121), we get a palindrome (166767661).

The spelling of 121136540 in words is "one hundred twenty-one million, one hundred thirty-six thousand, five hundred forty".