32220981 has 12 divisors (see below), whose sum is σ = 50121708. Its totient is φ = 19828224.

The previous prime is 32220973. The next prime is 32220983. The reversal of 32220981 is 18902223.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10458756 + 21762225 = 3234^2 + 4665^2 .

It is not a de Polignac number, because 32220981 - 2³ = 32220973 is a prime.

It is a super-2 number, since 2×32220981² = 2076383233204722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32220983) 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, 137580 + ... + 137813.

It is an arithmetic number, because the mean of its divisors is an integer number (4176809).

Almost surely, 2^32220981 is an apocalyptic number.

It is an amenable number.

32220981 is a deficient number, since it is larger than the sum of its proper divisors (17900727).

32220981 is a wasteful number, since it uses less digits than its factorization.

32220981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275412 (or 275409 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 32220981 is about 5676.3527903047. The cubic root of 32220981 is about 318.2093376594.

The spelling of 32220981 in words is "thirty-two million, two hundred twenty thousand, nine hundred eighty-one".