18111152021 has 8 divisors (see below), whose sum is σ = 18283272480. Its totient is φ = 17939084688.

The previous prime is 18111151999. The next prime is 18111152023. The reversal of 18111152021 is 12025111181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18111152021 - 2⁶ = 18111151957 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 (18111152023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1151750 + ... + 1167368.

It is an arithmetic number, because the mean of its divisors is an integer number (2285409060).

Almost surely, 2^18111152021 is an apocalyptic number.

It is an amenable number.

18111152021 is a deficient number, since it is larger than the sum of its proper divisors (172120459).

18111152021 is a wasteful number, since it uses less digits than its factorization.

18111152021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26563.

The product of its (nonzero) digits is 160, while the sum is 23.

The spelling of 18111152021 in words is "eighteen billion, one hundred eleven million, one hundred fifty-two thousand, twenty-one".