121699901 has 4 divisors (see below), whose sum is σ = 121730112. Its totient is φ = 121669692.

The previous prime is 121699871. The next prime is 121699937. The reversal of 121699901 is 109996121.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121699901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121699951) 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, 7925 + ... + 17498.

It is an arithmetic number, because the mean of its divisors is an integer number (30432528).

Almost surely, 2^121699901 is an apocalyptic number.

It is an amenable number.

121699901 is a deficient number, since it is larger than the sum of its proper divisors (30211).

121699901 is an equidigital number, since it uses as much as digits as its factorization.

121699901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30210.

The product of its (nonzero) digits is 8748, while the sum is 38.

The square root of 121699901 is about 11031.7678093767. The cubic root of 121699901 is about 495.5605675386.

The spelling of 121699901 in words is "one hundred twenty-one million, six hundred ninety-nine thousand, nine hundred one".