21424313724 has 96 divisors (see below), whose sum is σ = 55392325632. Its totient is φ = 6444169600.

The previous prime is 21424313719. The next prime is 21424313777. The reversal of 21424313724 is 42731342412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 2183269 + ... + 2193059.

It is an arithmetic number, because the mean of its divisors is an integer number (577003392).

Almost surely, 2^21424313724 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 21424313724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27696162816).

21424313724 is an abundant number, since it is smaller than the sum of its proper divisors (33968011908).

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

21424313724 is a wasteful number, since it uses less digits than its factorization.

21424313724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9968 (or 9944 counting only the distinct ones).

The product of its digits is 32256, while the sum is 33.

The spelling of 21424313724 in words is "twenty-one billion, four hundred twenty-four million, three hundred thirteen thousand, seven hundred twenty-four".