21342399936 has 224 divisors, whose sum is σ = 69226956288. Its totient is φ = 5710172160.

The previous prime is 21342399901. The next prime is 21342399973. The reversal of 21342399936 is 63999324312.

It is a happy number.

It is a congruent number.

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, 614590 + ... + 648386.

It is an arithmetic number, because the mean of its divisors is an integer number (309048912).

Almost surely, 2^21342399936 is an apocalyptic number.

21342399936 is a gapful number since it is divisible by the number (26) 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 21342399936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34613478144).

21342399936 is an abundant number, since it is smaller than the sum of its proper divisors (47884556352).

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

21342399936 is a wasteful number, since it uses less digits than its factorization.

21342399936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33859 (or 33849 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 51.

The spelling of 21342399936 in words is "twenty-one billion, three hundred forty-two million, three hundred ninety-nine thousand, nine hundred thirty-six".