121919013 has 10 divisors (see below), whose sum is σ = 182126054. Its totient is φ = 81279288.

The previous prime is 121919003. The next prime is 121919023. The reversal of 121919013 is 310919121.

It is an interprime number because it is at equal distance from previous prime (121919003) and next prime (121919023).

It can be written as a sum of positive squares in only one way, i.e., 61732449 + 60186564 = 7857^2 + 7758^2 .

It is not a de Polignac number, because 121919013 - 2⁴ = 121918997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121919003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 752506 + ... + 752667.

Almost surely, 2^121919013 is an apocalyptic number.

It is an amenable number.

121919013 is a deficient number, since it is larger than the sum of its proper divisors (60207041).

121919013 is an equidigital number, since it uses as much as digits as its factorization.

121919013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505185 (or 1505176 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 121919013 is about 11041.6942993365. The cubic root of 121919013 is about 495.8577963936.

The spelling of 121919013 in words is "one hundred twenty-one million, nine hundred nineteen thousand, thirteen".