32130021 has 16 divisors (see below), whose sum is σ = 53411328. Its totient is φ = 16690800.

The previous prime is 32130013. The next prime is 32130037. The reversal of 32130021 is 12003123.

It is a happy number.

It is not a de Polignac number, because 32130021 - 2³ = 32130013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 32129979 and 32130006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32130041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69315 + ... + 69776.

It is an arithmetic number, because the mean of its divisors is an integer number (3338208).

Almost surely, 2^32130021 is an apocalyptic number.

It is an amenable number.

32130021 is a deficient number, since it is larger than the sum of its proper divisors (21281307).

32130021 is a wasteful number, since it uses less digits than its factorization.

32130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139112.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 32130021 is about 5668.3349407035. The cubic root of 32130021 is about 317.9096198988.

Adding to 32130021 its reverse (12003123), we get a palindrome (44133144).

The spelling of 32130021 in words is "thirty-two million, one hundred thirty thousand, twenty-one".