21212641344 has 224 divisors, whose sum is σ = 60801601536. Its totient is φ = 6502809600.

The previous prime is 21212641337. The next prime is 21212641369. The reversal of 21212641344 is 44314621212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30260194 + ... + 30260894.

Almost surely, 2^21212641344 is an apocalyptic number.

21212641344 is a gapful number since it is divisible by the number (24) 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 21212641344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30400800768).

21212641344 is an abundant number, since it is smaller than the sum of its proper divisors (39588960192).

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

21212641344 is a wasteful number, since it uses less digits than its factorization.

21212641344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933 (or 923 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The spelling of 21212641344 in words is "twenty-one billion, two hundred twelve million, six hundred forty-one thousand, three hundred forty-four".