32213681 has 6 divisors (see below), whose sum is σ = 33287346. Its totient is φ = 31173600.

The previous prime is 32213669. The next prime is 32213689. The reversal of 32213681 is 18631223.

It can be written as a sum of positive squares in only one way, i.e., 24601600 + 7612081 = 4960^2 + 2759^2 .

It is a de Polignac number, because none of the positive numbers 2^k-32213681 is a prime.

It is a super-2 number, since 2×32213681² = 2075442487139522, which contains 22 as substring.

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 32213681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32213689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15800 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (5547891).

Almost surely, 2^32213681 is an apocalyptic number.

32213681 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

32213681 is a deficient number, since it is larger than the sum of its proper divisors (1073665).

32213681 is an equidigital number, since it uses as much as digits as its factorization.

32213681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33583 (or 33552 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 32213681 is about 5675.7097353547. The cubic root of 32213681 is about 318.1853046272.

The spelling of 32213681 in words is "thirty-two million, two hundred thirteen thousand, six hundred eighty-one".