16121581252 has 24 divisors (see below), whose sum is σ = 32254830720. Its totient is φ = 6906748800.

The previous prime is 16121581243. The next prime is 16121581297. The reversal of 16121581252 is 25218512161.

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, 24352 + ... + 181207.

It is an arithmetic number, because the mean of its divisors is an integer number (1343951280).

Almost surely, 2^16121581252 is an apocalyptic number.

It is an amenable number.

16121581252 is an abundant number, since it is smaller than the sum of its proper divisors (16133249468).

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

16121581252 is a wasteful number, since it uses less digits than its factorization.

16121581252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208371 (or 208369 counting only the distinct ones).

The product of its digits is 9600, while the sum is 34.

The spelling of 16121581252 in words is "sixteen billion, one hundred twenty-one million, five hundred eighty-one thousand, two hundred fifty-two".