21001111122 has 16 divisors (see below), whose sum is σ = 44212865760. Its totient is φ = 6631929792.

The previous prime is 21001111081. The next prime is 21001111181. The reversal of 21001111122 is 22111110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001111098 and 21001111107.

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, 92110023 + ... + 92110250.

It is an arithmetic number, because the mean of its divisors is an integer number (2763304110).

Almost surely, 2^21001111122 is an apocalyptic number.

21001111122 is an abundant number, since it is smaller than the sum of its proper divisors (23211754638).

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

21001111122 is a wasteful number, since it uses less digits than its factorization.

21001111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184220297.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001111122 its reverse (22111110012), we get a palindrome (43112221134).

The spelling of 21001111122 in words is "twenty-one billion, one million, one hundred eleven thousand, one hundred twenty-two".