21120022 has 16 divisors (see below), whose sum is σ = 39497472. Its totient is φ = 8228520.

The previous prime is 21120019. The next prime is 21120041. The reversal of 21120022 is 22002112.

It is a junction number, because it is equal to n+sod(n) for n = 21119990 and 21120008.

It is a congruent number.

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, 68418 + ... + 68725.

It is an arithmetic number, because the mean of its divisors is an integer number (2468592).

Almost surely, 2^21120022 is an apocalyptic number.

21120022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21120022 is a deficient number, since it is larger than the sum of its proper divisors (18377450).

21120022 is a wasteful number, since it uses less digits than its factorization.

21120022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137163.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21120022 is about 4595.6525107976. The cubic root of 21120022 is about 276.4170251785.

Adding to 21120022 its reverse (22002112), we get a palindrome (43122134).

The spelling of 21120022 in words is "twenty-one million, one hundred twenty thousand, twenty-two".