2158800911821 has 8 divisors (see below), whose sum is σ = 2233996869888. Its totient is φ = 2083952280000.

The previous prime is 2158800911819. The next prime is 2158800911921. The reversal of 2158800911821 is 1281190088512.

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 2158800911821 - 2¹ = 2158800911819 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 (2158800911921) 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, 86818915 + ... + 86843776.

It is an arithmetic number, because the mean of its divisors is an integer number (279249608736).

Almost surely, 2^{2158800911821} is an apocalyptic number.

It is an amenable number.

2158800911821 is a deficient number, since it is larger than the sum of its proper divisors (75195958067).

2158800911821 is a wasteful number, since it uses less digits than its factorization.

2158800911821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173663123.

The product of its (nonzero) digits is 92160, while the sum is 46.

The spelling of 2158800911821 in words is "two trillion, one hundred fifty-eight billion, eight hundred million, nine hundred eleven thousand, eight hundred twenty-one".