121390057 has 4 divisors (see below), whose sum is σ = 122926720. Its totient is φ = 119853396.

The previous prime is 121390051. The next prime is 121390063. The reversal of 121390057 is 750093121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (121390051) and next prime (121390063).

It is a cyclic number.

It is not a de Polignac number, because 121390057 - 2¹⁹ = 120865769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121390051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768213 + ... + 768370.

It is an arithmetic number, because the mean of its divisors is an integer number (30731680).

Almost surely, 2^121390057 is an apocalyptic number.

It is an amenable number.

121390057 is a deficient number, since it is larger than the sum of its proper divisors (1536663).

121390057 is an equidigital number, since it uses as much as digits as its factorization.

121390057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536662.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 121390057 is about 11017.7155980720. The cubic root of 121390057 is about 495.1396497456.

The spelling of 121390057 in words is "one hundred twenty-one million, three hundred ninety thousand, fifty-seven".