21001224434 has 8 divisors (see below), whose sum is σ = 31569293808. Its totient is φ = 10478126500.

The previous prime is 21001224427. The next prime is 21001224473. The reversal of 21001224434 is 43442210012.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11241692 + ... + 11243559.

It is an arithmetic number, because the mean of its divisors is an integer number (3946161726).

Almost surely, 2^21001224434 is an apocalyptic number.

21001224434 is a deficient number, since it is larger than the sum of its proper divisors (10568069374).

21001224434 is a wasteful number, since it uses less digits than its factorization.

21001224434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22485720.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21001224434 its reverse (43442210012), we get a palindrome (64443434446).

The spelling of 21001224434 in words is "twenty-one billion, one million, two hundred twenty-four thousand, four hundred thirty-four".