121215542552 has 64 divisors (see below), whose sum is σ = 253467029760. Its totient is φ = 53967513600.

The previous prime is 121215542549. The next prime is 121215542579. The reversal of 121215542552 is 255245512121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949052 + ... + 1069172.

It is an arithmetic number, because the mean of its divisors is an integer number (3960422340).

Almost surely, 2^121215542552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121215542552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126733514880).

121215542552 is an abundant number, since it is smaller than the sum of its proper divisors (132251487208).

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

121215542552 is a wasteful number, since it uses less digits than its factorization.

121215542552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120484 (or 120480 counting only the distinct ones).

The product of its digits is 40000, while the sum is 35.

The spelling of 121215542552 in words is "one hundred twenty-one billion, two hundred fifteen million, five hundred forty-two thousand, five hundred fifty-two".