21447604743 has 8 divisors (see below), whose sum is σ = 28598579328. Its totient is φ = 14297516664.

The previous prime is 21447604729. The next prime is 21447604769. The reversal of 21447604743 is 34740674412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21447604743 - 2⁸ = 21447604487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21447604695 and 21447604704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447604793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162955 + ... + 263532.

It is an arithmetic number, because the mean of its divisors is an integer number (3574822416).

Almost surely, 2^21447604743 is an apocalyptic number.

21447604743 is a deficient number, since it is larger than the sum of its proper divisors (7150974585).

21447604743 is a wasteful number, since it uses less digits than its factorization.

21447604743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443253.

The product of its (nonzero) digits is 451584, while the sum is 42.

The spelling of 21447604743 in words is "twenty-one billion, four hundred forty-seven million, six hundred four thousand, seven hundred forty-three".