21380441724 has 48 divisors (see below), whose sum is σ = 55636912800. Its totient is φ = 7100310528.

The previous prime is 21380441723. The next prime is 21380441767. The reversal of 21380441724 is 42714408312.

21380441724 is a `hidden beast` number, since 213 + 8 + 0 + 4 + 417 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21380441723) 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, 338917 + ... + 397020.

It is an arithmetic number, because the mean of its divisors is an integer number (1159102350).

Almost surely, 2^21380441724 is an apocalyptic number.

It is an amenable number.

21380441724 is an abundant number, since it is smaller than the sum of its proper divisors (34256471076).

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

21380441724 is a wasteful number, since it uses less digits than its factorization.

21380441724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736219 (or 736211 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The spelling of 21380441724 in words is "twenty-one billion, three hundred eighty million, four hundred forty-one thousand, seven hundred twenty-four".