121900657 has 8 divisors (see below), whose sum is σ = 127391616. Its totient is φ = 116530512.

The previous prime is 121900633. The next prime is 121900663. The reversal of 121900657 is 756009121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121900657 - 2¹⁹ = 121376369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121900697) 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, 28138 + ... + 32179.

It is an arithmetic number, because the mean of its divisors is an integer number (15923952).

Almost surely, 2^121900657 is an apocalyptic number.

It is an amenable number.

121900657 is a deficient number, since it is larger than the sum of its proper divisors (5490959).

121900657 is an equidigital number, since it uses as much as digits as its factorization.

121900657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60407.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 121900657 is about 11040.8630550333. The cubic root of 121900657 is about 495.8329098663.

Adding to 121900657 its reverse (756009121), we get a palindrome (877909778).

The spelling of 121900657 in words is "one hundred twenty-one million, nine hundred thousand, six hundred fifty-seven".