21211122 has 32 divisors (see below), whose sum is σ = 44251200. Its totient is φ = 6769728.

The previous prime is 21211109. The next prime is 21211139. The reversal of 21211122 is 22111212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21211098 and 21211107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23748 + ... + 24624.

It is an arithmetic number, because the mean of its divisors is an integer number (1382850).

Almost surely, 2^21211122 is an apocalyptic number.

21211122 is an abundant number, since it is smaller than the sum of its proper divisors (23040078).

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

21211122 is a wasteful number, since it uses less digits than its factorization.

21211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its digits is 16, while the sum is 12.

The square root of 21211122 is about 4605.5533869449. The cubic root of 21211122 is about 276.8138914170.

Adding to 21211122 its reverse (22111212), we get a palindrome (43322334).

The spelling of 21211122 in words is "twenty-one million, two hundred eleven thousand, one hundred twenty-two".