2158498821 has 16 divisors (see below), whose sum is σ = 2985283136. Its totient is φ = 1386274176.

The previous prime is 2158498813. The next prime is 2158498843. The reversal of 2158498821 is 1288948512.

It is not a de Polignac number, because 2158498821 - 2³ = 2158498813 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 (2158498861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105190 + ... + 124023.

It is an arithmetic number, because the mean of its divisors is an integer number (186580196).

Almost surely, 2^2158498821 is an apocalyptic number.

It is an amenable number.

2158498821 is a deficient number, since it is larger than the sum of its proper divisors (826784315).

2158498821 is a wasteful number, since it uses less digits than its factorization.

2158498821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229332.

The product of its digits is 368640, while the sum is 48.

The square root of 2158498821 is about 46459.6472328407. The cubic root of 2158498821 is about 1292.3612823851.

The spelling of 2158498821 in words is "two billion, one hundred fifty-eight million, four hundred ninety-eight thousand, eight hundred twenty-one".