11921907436 has 6 divisors (see below), whose sum is σ = 20863338020. Its totient is φ = 5960953716.

The previous prime is 11921907391. The next prime is 11921907443. The reversal of 11921907436 is 63470912911.

It is a junction number, because it is equal to n+sod(n) for n = 11921907392 and 11921907401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1490238426 + ... + 1490238433.

Almost surely, 2^11921907436 is an apocalyptic number.

It is an amenable number.

11921907436 is a deficient number, since it is larger than the sum of its proper divisors (8941430584).

11921907436 is a wasteful number, since it uses less digits than its factorization.

11921907436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980476863 (or 2980476861 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 11921907436 in words is "eleven billion, nine hundred twenty-one million, nine hundred seven thousand, four hundred thirty-six".