21002223434 has 16 divisors (see below), whose sum is σ = 31934305728. Its totient is φ = 10358297952.

The previous prime is 21002223433. The next prime is 21002223461. The reversal of 21002223434 is 43432220012.

It is not an unprimeable number, because it can be changed into a prime (21002223433) 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, 160742 + ... + 260465.

It is an arithmetic number, because the mean of its divisors is an integer number (1995894108).

Almost surely, 2^21002223434 is an apocalyptic number.

21002223434 is a deficient number, since it is larger than the sum of its proper divisors (10932082294).

21002223434 is a wasteful number, since it uses less digits than its factorization.

21002223434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421549.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21002223434 its reverse (43432220012), we get a palindrome (64434443446).

The spelling of 21002223434 in words is "twenty-one billion, two million, two hundred twenty-three thousand, four hundred thirty-four".