21110122000 has 160 divisors (see below), whose sum is σ = 55814713344. Its totient is φ = 7658496000.

The previous prime is 21110121983. The next prime is 21110122003. The reversal of 21110122000 is 22101112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21110122003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12693169 + ... + 12694831.

Almost surely, 2^21110122000 is an apocalyptic number.

21110122000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27907356672).

21110122000 is an abundant number, since it is smaller than the sum of its proper divisors (34704591344).

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

21110122000 is a wasteful number, since it uses less digits than its factorization.

21110122000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274 (or 2258 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21110122000 its reverse (22101112), we get a palindrome (21132223112).

The spelling of 21110122000 in words is "twenty-one billion, one hundred ten million, one hundred twenty-two thousand".