121553416 has 16 divisors (see below), whose sum is σ = 230263740. Its totient is φ = 60149760.

The previous prime is 121553407. The next prime is 121553423. The reversal of 121553416 is 614355121.

It can be written as a sum of positive squares in 2 ways, for example, as 115648516 + 5904900 = 10754^2 + 2430^2 .

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, 77545 + ... + 79096.

Almost surely, 2^121553416 is an apocalyptic number.

It is an amenable number.

121553416 is a deficient number, since it is larger than the sum of its proper divisors (108710324).

121553416 is a wasteful number, since it uses less digits than its factorization.

121553416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156744 (or 156740 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 121553416 is about 11025.1265752371. The cubic root of 121553416 is about 495.3616593116.

The spelling of 121553416 in words is "one hundred twenty-one million, five hundred fifty-three thousand, four hundred sixteen".