2151046821 has 32 divisors (see below), whose sum is σ = 3585650688. Its totient is φ = 1114338240.

The previous prime is 2151046813. The next prime is 2151046831. The reversal of 2151046821 is 1286401512.

It is not a de Polignac number, because 2151046821 - 2³ = 2151046813 is a prime.

It is a super-2 number, since 2×2151046821² = 9254004852268412082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151046831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72091 + ... + 97463.

It is an arithmetic number, because the mean of its divisors is an integer number (112051584).

Almost surely, 2^2151046821 is an apocalyptic number.

2151046821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2151046821 is a deficient number, since it is larger than the sum of its proper divisors (1434603867).

2151046821 is a wasteful number, since it uses less digits than its factorization.

2151046821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25761.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 2151046821 is about 46379.3792649276. The cubic root of 2151046821 is about 1290.8723184705.

The spelling of 2151046821 in words is "two billion, one hundred fifty-one million, forty-six thousand, eight hundred twenty-one".