32001213221 has 4 divisors (see below), whose sum is σ = 32002229292. Its totient is φ = 32000197152.

The previous prime is 32001213191. The next prime is 32001213241. The reversal of 32001213221 is 12231210023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1090650625 + 30910562596 = 33025^2 + 175814^2 .

It is a cyclic number.

It is not a de Polignac number, because 32001213221 - 2⁶ = 32001213157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 32001213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32001213241) 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, 459230 + ... + 524303.

It is an arithmetic number, because the mean of its divisors is an integer number (8000557323).

Almost surely, 2^32001213221 is an apocalyptic number.

It is an amenable number.

32001213221 is a deficient number, since it is larger than the sum of its proper divisors (1016071).

32001213221 is an equidigital number, since it uses as much as digits as its factorization.

32001213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016070.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 32001213221 its reverse (12231210023), we get a palindrome (44232423244).

The spelling of 32001213221 in words is "thirty-two billion, one million, two hundred thirteen thousand, two hundred twenty-one".