21231122 has 16 divisors (see below), whose sum is σ = 35482752. Its totient is φ = 9444720.

The previous prime is 21231107. The next prime is 21231143. The reversal of 21231122 is 22113212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21231097 and 21231106.

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, 9233 + ... + 11300.

It is an arithmetic number, because the mean of its divisors is an integer number (2217672).

Almost surely, 2^21231122 is an apocalyptic number.

21231122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21231122 is a deficient number, since it is larger than the sum of its proper divisors (14251630).

21231122 is a wasteful number, since it uses less digits than its factorization.

21231122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20593.

The product of its digits is 48, while the sum is 14.

The square root of 21231122 is about 4607.7241670916. The cubic root of 21231122 is about 276.9008668362.

Adding to 21231122 its reverse (22113212), we get a palindrome (43344334).

The spelling of 21231122 in words is "twenty-one million, two hundred thirty-one thousand, one hundred twenty-two".