21022122 has 32 divisors (see below), whose sum is σ = 46033920. Its totient is φ = 6347120.

The previous prime is 21022117. The next prime is 21022163. The reversal of 21022122 is 22122012.

It is a super-2 number, since 2×21022122² = 883859226765768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022098 and 21022107.

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, 28879 + ... + 29597.

It is an arithmetic number, because the mean of its divisors is an integer number (1438560).

Almost surely, 2^21022122 is an apocalyptic number.

21022122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21022122 is an abundant number, since it is smaller than the sum of its proper divisors (25011798).

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

21022122 is a wasteful number, since it uses less digits than its factorization.

21022122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21022122 is about 4584.9887677071. The cubic root of 21022122 is about 275.9892612919.

Adding to 21022122 its reverse (22122012), we get a palindrome (43144134).

It can be divided in two parts, 2102 and 2122, that added together give a palindrome (4224).

The spelling of 21022122 in words is "twenty-one million, twenty-two thousand, one hundred twenty-two".