11852021851 has 4 divisors (see below), whose sum is σ = 11969368704. Its totient is φ = 11734675000.

The previous prime is 11852021843. The next prime is 11852021873. The reversal of 11852021851 is 15812025811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15812025811 = 101 ⋅156554711.

It is a cyclic number.

It is not a de Polignac number, because 11852021851 - 2³ = 11852021843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11852021351) 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, 58673275 + ... + 58673476.

It is an arithmetic number, because the mean of its divisors is an integer number (2992342176).

Almost surely, 2^11852021851 is an apocalyptic number.

11852021851 is a deficient number, since it is larger than the sum of its proper divisors (117346853).

11852021851 is a wasteful number, since it uses less digits than its factorization.

11852021851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117346852.

The product of its (nonzero) digits is 6400, while the sum is 34.

The spelling of 11852021851 in words is "eleven billion, eight hundred fifty-two million, twenty-one thousand, eight hundred fifty-one".