21110122420 has 12 divisors (see below), whose sum is σ = 44331257124. Its totient is φ = 8444048960.

The previous prime is 21110122403. The next prime is 21110122433. The reversal of 21110122420 is 2422101112.

It can be written as a sum of positive squares in 2 ways, for example, as 4716392976 + 16393729444 = 68676^2 + 128038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21110122394 and 21110122403.

It is a congruent number.

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, 527753041 + ... + 527753080.

It is an arithmetic number, because the mean of its divisors is an integer number (3694271427).

Almost surely, 2^21110122420 is an apocalyptic number.

21110122420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110122420 is an abundant number, since it is smaller than the sum of its proper divisors (23221134704).

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

21110122420 is a wasteful number, since it uses less digits than its factorization.

21110122420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055506130 (or 1055506128 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21110122420 its reverse (2422101112), we get a palindrome (23532223532).

The spelling of 21110122420 in words is "twenty-one billion, one hundred ten million, one hundred twenty-two thousand, four hundred twenty".