21111112022 has 128 divisors (see below), whose sum is σ = 43444961280. Its totient is φ = 7428101760.

The previous prime is 21111112019. The next prime is 21111112111. The reversal of 21111112022 is 22021111112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21111111988 and 21111112006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43349063 + ... + 43349549.

It is an arithmetic number, because the mean of its divisors is an integer number (339413760).

Almost surely, 2^21111112022 is an apocalyptic number.

21111112022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111112022 is an abundant number, since it is smaller than the sum of its proper divisors (22333849258).

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

21111112022 is a wasteful number, since it uses less digits than its factorization.

21111112022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111112022 its reverse (22021111112), we get a palindrome (43132223134).

The spelling of 21111112022 in words is "twenty-one billion, one hundred eleven million, one hundred twelve thousand, twenty-two".