21131322 has 16 divisors (see below), whose sum is σ = 42979680. Its totient is φ = 6924272.

The previous prime is 21131317. The next prime is 21131333. The reversal of 21131322 is 22313112.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29493 + ... + 30200.

It is an arithmetic number, because the mean of its divisors is an integer number (2686230).

Almost surely, 2^21131322 is an apocalyptic number.

21131322 is an abundant number, since it is smaller than the sum of its proper divisors (21848358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131322 is a wasteful number, since it uses less digits than its factorization.

21131322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59757.

The product of its digits is 72, while the sum is 15.

The square root of 21131322 is about 4596.8817691996. The cubic root of 21131322 is about 276.4663141973.

Adding to 21131322 its reverse (22313112), we get a palindrome (43444434).

The spelling of 21131322 in words is "twenty-one million, one hundred thirty-one thousand, three hundred twenty-two".