121555412 has 24 divisors (see below), whose sum is σ = 233177952. Its totient is φ = 54986400.

The previous prime is 121555411. The next prime is 121555429. The reversal of 121555412 is 214555121.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555411) 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, 2738 + ... + 15830.

It is an arithmetic number, because the mean of its divisors is an integer number (9715748).

Almost surely, 2^121555412 is an apocalyptic number.

It is an amenable number.

121555412 is a deficient number, since it is larger than the sum of its proper divisors (111622540).

121555412 is a wasteful number, since it uses less digits than its factorization.

121555412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13319 (or 13317 counting only the distinct ones).

The product of its digits is 2000, while the sum is 26.

The square root of 121555412 is about 11025.2170953682. The cubic root of 121555412 is about 495.3643707024.

The spelling of 121555412 in words is "one hundred twenty-one million, five hundred fifty-five thousand, four hundred twelve".