21434689724 has 48 divisors (see below), whose sum is σ = 45087307776. Its totient is φ = 8722209600.

The previous prime is 21434689723. The next prime is 21434689747. The reversal of 21434689724 is 42798643412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434689723) 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, 186962 + ... + 278969.

It is an arithmetic number, because the mean of its divisors is an integer number (939318912).

Almost surely, 2^21434689724 is an apocalyptic number.

It is an amenable number.

21434689724 is an abundant number, since it is smaller than the sum of its proper divisors (23652618052).

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

21434689724 is a wasteful number, since it uses less digits than its factorization.

21434689724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466026 (or 466024 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 50.

The spelling of 21434689724 in words is "twenty-one billion, four hundred thirty-four million, six hundred eighty-nine thousand, seven hundred twenty-four".