32000021 has 4 divisors (see below), whose sum is σ = 33103500. Its totient is φ = 30896544.

The previous prime is 32000011. The next prime is 32000053. The reversal of 32000021 is 12000023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12000023 = 7 ⋅1714289.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 19140625 = 3586^2 + 4375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32000021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31999972 and 32000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32000011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551696 + ... + 551753.

It is an arithmetic number, because the mean of its divisors is an integer number (8275875).

Almost surely, 2^32000021 is an apocalyptic number.

It is an amenable number.

32000021 is a deficient number, since it is larger than the sum of its proper divisors (1103479).

32000021 is a wasteful number, since it uses less digits than its factorization.

32000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103478.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 32000021 is about 5656.8561056474. The cubic root of 32000021 is about 317.4802798424.

Adding to 32000021 its reverse (12000023), we get a palindrome (44000044).

The spelling of 32000021 in words is "thirty-two million, twenty-one", and thus it is an aban number and an uban number.