21344012412 has 48 divisors (see below), whose sum is σ = 51609804960. Its totient is φ = 6857367552.

The previous prime is 21344012411. The next prime is 21344012419. The reversal of 21344012412 is 21421044312.

It is a super-2 number, since 2×21344012412² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344012411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147648 + ... + 253944.

It is an arithmetic number, because the mean of its divisors is an integer number (1075204270).

Almost surely, 2^21344012412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21344012412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25804902480).

21344012412 is an abundant number, since it is smaller than the sum of its proper divisors (30265792548).

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

21344012412 is a wasteful number, since it uses less digits than its factorization.

21344012412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106910 (or 106908 counting only the distinct ones).

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

Adding to 21344012412 its reverse (21421044312), we get a palindrome (42765056724).

The spelling of 21344012412 in words is "twenty-one billion, three hundred forty-four million, twelve thousand, four hundred twelve".