2159799021 has 12 divisors (see below), whose sum is σ = 3120218140. Its totient is φ = 1439631360.

The previous prime is 2159799013. The next prime is 2159799043. The reversal of 2159799021 is 1209979512.

It can be written as a sum of positive squares in 2 ways, for example, as 1631028996 + 528770025 = 40386^2 + 22995^2 .

It is not a de Polignac number, because 2159799021 - 2³ = 2159799013 is a prime.

It is a super-2 number, since 2×2159799021² = 9329463622225116882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159799071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52845 + ... + 84333.

Almost surely, 2^2159799021 is an apocalyptic number.

It is an amenable number.

2159799021 is a deficient number, since it is larger than the sum of its proper divisors (960419119).

2159799021 is a wasteful number, since it uses less digits than its factorization.

2159799021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39116 (or 39113 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 2159799021 is about 46473.6379144134. The cubic root of 2159799021 is about 1292.6207205414.

The spelling of 2159799021 in words is "two billion, one hundred fifty-nine million, seven hundred ninety-nine thousand, twenty-one".