121540220416 has 40 divisors (see below), whose sum is σ = 242905703040. Its totient is φ = 60754434048.

The previous prime is 121540220387. The next prime is 121540220423. The reversal of 121540220416 is 614022045121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100870 + ... + 2157946.

It is an arithmetic number, because the mean of its divisors is an integer number (6072642576).

Almost surely, 2^121540220416 is an apocalyptic number.

121540220416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121540220416 is a deficient number, since it is larger than the sum of its proper divisors (121365482624).

121540220416 is an frugal number, since it uses more digits than its factorization.

121540220416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61254 (or 61238 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 121540220416 its reverse (614022045121), we get a palindrome (735562265537).

The spelling of 121540220416 in words is "one hundred twenty-one billion, five hundred forty million, two hundred twenty thousand, four hundred sixteen".