21224034047 has 64 divisors (see below), whose sum is σ = 25239029760. Its totient is φ = 17717145600.

The previous prime is 21224034043. The next prime is 21224034059. The reversal of 21224034047 is 74043042212.

It is a cyclic number.

It is not a de Polignac number, because 21224034047 - 2² = 21224034043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224034043) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33007508 + ... + 33008150.

It is an arithmetic number, because the mean of its divisors is an integer number (394359840).

Almost surely, 2^21224034047 is an apocalyptic number.

21224034047 is a deficient number, since it is larger than the sum of its proper divisors (4014995713).

21224034047 is a wasteful number, since it uses less digits than its factorization.

21224034047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 10752, while the sum is 29.

Adding to 21224034047 its reverse (74043042212), we get a palindrome (95267076259).

The spelling of 21224034047 in words is "twenty-one billion, two hundred twenty-four million, thirty-four thousand, forty-seven".