21122434212 has 72 divisors (see below), whose sum is σ = 54710267136. Its totient is φ = 6337320000.

The previous prime is 21122434117. The next prime is 21122434241. The reversal of 21122434212 is 21243422112.

It is a super-3 number, since 3×21122434212³ (a number of 32 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74637 + ... + 218667.

Almost surely, 2^21122434212 is an apocalyptic number.

21122434212 is a gapful number since it is divisible by the number (22) 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 21122434212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27355133568).

21122434212 is an abundant number, since it is smaller than the sum of its proper divisors (33587832924).

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

21122434212 is a wasteful number, since it uses less digits than its factorization.

21122434212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144161 (or 144148 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

Adding to 21122434212 its reverse (21243422112), we get a palindrome (42365856324).

The spelling of 21122434212 in words is "twenty-one billion, one hundred twenty-two million, four hundred thirty-four thousand, two hundred twelve".