3251000021 has 32 divisors (see below), whose sum is σ = 3594240000. Its totient is φ = 2930735808.

The previous prime is 3251000009. The next prime is 3251000023. The reversal of 3251000021 is 1200001523.

It is a happy number.

It is not a de Polignac number, because 3251000021 - 2⁶ = 3250999957 is a prime.

It is a super-2 number, since 2×3251000021² = 21138002273084000882, 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 (3251000023) 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, 5427080 + ... + 5427678.

It is an arithmetic number, because the mean of its divisors is an integer number (112320000).

Almost surely, 2^3251000021 is an apocalyptic number.

It is an amenable number.

3251000021 is a deficient number, since it is larger than the sum of its proper divisors (343239979).

3251000021 is a wasteful number, since it uses less digits than its factorization.

3251000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 3251000021 is about 57017.5413447476. The cubic root of 3251000021 is about 1481.3999446895.

Adding to 3251000021 its reverse (1200001523), we get a palindrome (4451001544).

The spelling of 3251000021 in words is "three billion, two hundred fifty-one million, twenty-one", and thus it is an aban number.