11874947821 has 4 divisors (see below), whose sum is σ = 12954488544. Its totient is φ = 10795407100.

The previous prime is 11874947813. The next prime is 11874947827. The reversal of 11874947821 is 12874947811.

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.

It is a cyclic number.

It is not a de Polignac number, because 11874947821 - 2³ = 11874947813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11874947827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539770345 + ... + 539770366.

It is an arithmetic number, because the mean of its divisors is an integer number (3238622136).

Almost surely, 2^11874947821 is an apocalyptic number.

11874947821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11874947821 is a deficient number, since it is larger than the sum of its proper divisors (1079540723).

11874947821 is a wasteful number, since it uses less digits than its factorization.

11874947821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079540722.

The product of its digits is 903168, while the sum is 52.

The spelling of 11874947821 in words is "eleven billion, eight hundred seventy-four million, nine hundred forty-seven thousand, eight hundred twenty-one".