21724446029 has 16 divisors (see below), whose sum is σ = 25526707584. Its totient is φ = 18227246400.

The previous prime is 21724446019. The next prime is 21724446061. The reversal of 21724446029 is 92064442712.

It is not a de Polignac number, because 21724446029 - 2⁸ = 21724445773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21724446019) 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, 1352087 + ... + 1368059.

It is an arithmetic number, because the mean of its divisors is an integer number (1595419224).

Almost surely, 2^21724446029 is an apocalyptic number.

It is an amenable number.

21724446029 is a deficient number, since it is larger than the sum of its proper divisors (3802261555).

21724446029 is a wasteful number, since it uses less digits than its factorization.

21724446029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25508.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 21724446029 in words is "twenty-one billion, seven hundred twenty-four million, four hundred forty-six thousand, twenty-nine".