21013224434 has 32 divisors (see below), whose sum is σ = 33388312320. Its totient is φ = 9901487232.

The previous prime is 21013224413. The next prime is 21013224443. The reversal of 21013224434 is 43442231012.

It is a super-2 number, since 2×21013224434² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6165959 + ... + 6169365.

It is an arithmetic number, because the mean of its divisors is an integer number (1043384760).

Almost surely, 2^21013224434 is an apocalyptic number.

21013224434 is a deficient number, since it is larger than the sum of its proper divisors (12375087886).

21013224434 is a wasteful number, since it uses less digits than its factorization.

21013224434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5954.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21013224434 its reverse (43442231012), we get a palindrome (64455455446).

The spelling of 21013224434 in words is "twenty-one billion, thirteen million, two hundred twenty-four thousand, four hundred thirty-four".