121290388 has 6 divisors (see below), whose sum is σ = 212258186. Its totient is φ = 60645192.

The previous prime is 121290373. The next prime is 121290391. The reversal of 121290388 is 883092121.

It can be written as a sum of positive squares in only one way, i.e., 121264144 + 26244 = 11012^2 + 162^2 .

It is a super-2 number, since 2×121290388² = 29422716442381088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15161295 + ... + 15161302.

Almost surely, 2^121290388 is an apocalyptic number.

It is an amenable number.

121290388 is a deficient number, since it is larger than the sum of its proper divisors (90967798).

121290388 is a wasteful number, since it uses less digits than its factorization.

121290388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30322601 (or 30322599 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 121290388 is about 11013.1915446886. The cubic root of 121290388 is about 495.0040988675.

The spelling of 121290388 in words is "one hundred twenty-one million, two hundred ninety thousand, three hundred eighty-eight".