3201000021 has 12 divisors (see below), whose sum is σ = 4641660972. Its totient is φ = 2125694976.

The previous prime is 3200999993. The next prime is 3201000029. The reversal of 3201000021 is 1200001023.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1853302500 + 1347697521 = 43050^2 + 36711^2 .

It is not a de Polignac number, because 3201000021 - 2¹⁷ = 3200868949 is a prime.

It is a super-2 number, since 2×3201000021² = 20492802268884000882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3200999967 and 3201000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3201000029) 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, 689646 + ... + 694271.

It is an arithmetic number, because the mean of its divisors is an integer number (386805081).

Almost surely, 2^3201000021 is an apocalyptic number.

It is an amenable number.

3201000021 is a deficient number, since it is larger than the sum of its proper divisors (1440660951).

3201000021 is a wasteful number, since it uses less digits than its factorization.

3201000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384180 (or 1384177 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 3201000021 is about 56577.3808248491. The cubic root of 3201000021 is about 1473.7660880045.

Adding to 3201000021 its reverse (1200001023), we get a palindrome (4401001044).

The spelling of 3201000021 in words is "three billion, two hundred one million, twenty-one", and thus it is an aban number.