121198390 has 16 divisors (see below), whose sum is σ = 221855760. Its totient is φ = 47657440.

The previous prime is 121198387. The next prime is 121198393. The reversal of 121198390 is 93891121.

It is an interprime number because it is at equal distance from previous prime (121198387) and next prime (121198393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121198393) 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, 102121 + ... + 103300.

It is an arithmetic number, because the mean of its divisors is an integer number (13865985).

Almost surely, 2^121198390 is an apocalyptic number.

121198390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121198390 is a deficient number, since it is larger than the sum of its proper divisors (100657370).

121198390 is a wasteful number, since it uses less digits than its factorization.

121198390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205487.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 121198390 is about 11009.0140339633. The cubic root of 121198390 is about 494.8789147083.

The spelling of 121198390 in words is "one hundred twenty-one million, one hundred ninety-eight thousand, three hundred ninety".