21211231122 has 48 divisors (see below), whose sum is σ = 47455968768. Its totient is φ = 6840054720.

The previous prime is 21211231121. The next prime is 21211231199. The reversal of 21211231122 is 22113211212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21211231095 and 21211231104.

It is not an unprimeable number, because it can be changed into a prime (21211231121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2731998 + ... + 2739750.

It is an arithmetic number, because the mean of its divisors is an integer number (988666016).

Almost surely, 2^21211231122 is an apocalyptic number.

21211231122 is an abundant number, since it is smaller than the sum of its proper divisors (26244737646).

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

21211231122 is a wasteful number, since it uses less digits than its factorization.

21211231122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12695 (or 12692 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21211231122 its reverse (22113211212), we get a palindrome (43324442334).

The spelling of 21211231122 in words is "twenty-one billion, two hundred eleven million, two hundred thirty-one thousand, one hundred twenty-two".