121541015420 has 24 divisors (see below), whose sum is σ = 278439417648. Its totient is φ = 44196732800.

The previous prime is 121541015419. The next prime is 121541015429. The reversal of 121541015420 is 24510145121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121541015420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121541015429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276229361 + ... + 276229800.

It is an arithmetic number, because the mean of its divisors is an integer number (11601642402).

Almost surely, 2^121541015420 is an apocalyptic number.

121541015420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121541015420 is an abundant number, since it is smaller than the sum of its proper divisors (156898402228).

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

121541015420 is a wasteful number, since it uses less digits than its factorization.

121541015420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552459181 (or 552459179 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The spelling of 121541015420 in words is "one hundred twenty-one billion, five hundred forty-one million, fifteen thousand, four hundred twenty".