11807212921 has 45 divisors (see below), whose sum is σ = 14842969461. Its totient is φ = 9364839624.

The previous prime is 11807212903. The next prime is 11807212933. The reversal of 11807212921 is 12921270811.

The square root of 11807212921 is 108661.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 11807212921 - 2⁹ = 11807212409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11807212951) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 274586326 + ... + 274586368.

Almost surely, 2^11807212921 is an apocalyptic number.

11807212921 is the 108661-st square number.

11807212921 is the 54331-st centered octagonal number.

It is an amenable number.

11807212921 is a deficient number, since it is larger than the sum of its proper divisors (3035756540).

11807212921 is an frugal number, since it uses more digits than its factorization.

11807212921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 11807212921 in words is "eleven billion, eight hundred seven million, two hundred twelve thousand, nine hundred twenty-one".