21313122 has 16 divisors (see below), whose sum is σ = 43618080. Its totient is φ = 6939072.

The previous prime is 21313093. The next prime is 21313129. The reversal of 21313122 is 22131312.

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

It is not an unprimeable number, because it can be changed into a prime (21313129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41047 + ... + 41562.

It is an arithmetic number, because the mean of its divisors is an integer number (2726130).

Almost surely, 2^21313122 is an apocalyptic number.

21313122 is an abundant number, since it is smaller than the sum of its proper divisors (22304958).

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

21313122 is a wasteful number, since it uses less digits than its factorization.

21313122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82657.

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

The square root of 21313122 is about 4616.6136940403. The cubic root of 21313122 is about 277.2568960919.

Adding to 21313122 its reverse (22131312), we get a palindrome (43444434).

It can be divided in two parts, 2131312 and 2, that multiplied together give a palindrome (4262624).

The spelling of 21313122 in words is "twenty-one million, three hundred thirteen thousand, one hundred twenty-two".