11975421951 has 24 divisors (see below), whose sum is σ = 17399264480. Its totient is φ = 7936906176.

The previous prime is 11975421949. The next prime is 11975421959. The reversal of 11975421951 is 15912457911.

11975421951 is a `hidden beast` number, since 1 + 1 + 97 + 542 + 19 + 5 + 1 = 666.

It is not a de Polignac number, because 11975421951 - 2¹ = 11975421949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11975421897 and 11975421906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11975421959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1506750 + ... + 1514676.

Almost surely, 2^11975421951 is an apocalyptic number.

11975421951 is a deficient number, since it is larger than the sum of its proper divisors (5423842529).

11975421951 is a wasteful number, since it uses less digits than its factorization.

11975421951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8895 (or 8892 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The spelling of 11975421951 in words is "eleven billion, nine hundred seventy-five million, four hundred twenty-one thousand, nine hundred fifty-one".