11951422421 has 4 divisors (see below), whose sum is σ = 11989851744. Its totient is φ = 11912993100.

The previous prime is 11951422411. The next prime is 11951422423. The reversal of 11951422421 is 12422415911.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12422415911 = 111301 ⋅111611.

It is a cyclic number.

It is not a de Polignac number, because 11951422421 - 2¹⁰ = 11951421397 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 (11951422423) 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, 19214195 + ... + 19214816.

It is an arithmetic number, because the mean of its divisors is an integer number (2997462936).

Almost surely, 2^11951422421 is an apocalyptic number.

It is an amenable number.

11951422421 is a deficient number, since it is larger than the sum of its proper divisors (38429323).

11951422421 is an equidigital number, since it uses as much as digits as its factorization.

11951422421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38429322.

The product of its digits is 5760, while the sum is 32.

The spelling of 11951422421 in words is "eleven billion, nine hundred fifty-one million, four hundred twenty-two thousand, four hundred twenty-one".