11890298921 has 4 divisors (see below), whose sum is σ = 11922176772. Its totient is φ = 11858421072.

The previous prime is 11890298881. The next prime is 11890298989. The reversal of 11890298921 is 12989209811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9256556521 + 2633742400 = 96211^2 + 51320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11890298921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11890298921.

It is not an unprimeable number, because it can be changed into a prime (11890298221) 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, 15938366 + ... + 15939111.

It is an arithmetic number, because the mean of its divisors is an integer number (2980544193).

Almost surely, 2^11890298921 is an apocalyptic number.

It is an amenable number.

11890298921 is a deficient number, since it is larger than the sum of its proper divisors (31877851).

11890298921 is an equidigital number, since it uses as much as digits as its factorization.

11890298921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31877850.

The product of its (nonzero) digits is 186624, while the sum is 50.

The spelling of 11890298921 in words is "eleven billion, eight hundred ninety million, two hundred ninety-eight thousand, nine hundred twenty-one".