21122122 has 8 divisors (see below), whose sum is σ = 36209376. Its totient is φ = 9052332.

The previous prime is 21122111. The next prime is 21122161. The reversal of 21122122 is 22122112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21122122² = 892288075565768, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 754348 + ... + 754375.

It is an arithmetic number, because the mean of its divisors is an integer number (4526172).

Almost surely, 2^21122122 is an apocalyptic number.

21122122 is a deficient number, since it is larger than the sum of its proper divisors (15087254).

21122122 is a wasteful number, since it uses less digits than its factorization.

21122122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508732.

The product of its digits is 32, while the sum is 13.

The square root of 21122122 is about 4595.8809819228. The cubic root of 21122122 is about 276.4261864145.

Adding to 21122122 its reverse (22122112), we get a palindrome (43244234).

The spelling of 21122122 in words is "twenty-one million, one hundred twenty-two thousand, one hundred twenty-two".