21002344430 has 32 divisors (see below), whose sum is σ = 39534398784. Its totient is φ = 8018055936.

The previous prime is 21002344427. The next prime is 21002344463. The reversal of 21002344430 is 3444320012.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 21002344396 and 21002344405.

It is a congruent number.

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, 5204 + ... + 205016.

It is an arithmetic number, because the mean of its divisors is an integer number (1235449962).

Almost surely, 2^21002344430 is an apocalyptic number.

21002344430 is a deficient number, since it is larger than the sum of its proper divisors (18532054354).

21002344430 is a wasteful number, since it uses less digits than its factorization.

21002344430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200300.

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

Adding to 21002344430 its reverse (3444320012), we get a palindrome (24446664442).

The spelling of 21002344430 in words is "twenty-one billion, two million, three hundred forty-four thousand, four hundred thirty".