21113433430 has 16 divisors (see below), whose sum is σ = 38044584144. Its totient is φ = 8436394720.

The previous prime is 21113433427. The next prime is 21113433443. The reversal of 21113433430 is 3433431112.

It is a junction number, because it is equal to n+sod(n) for n = 21113433395 and 21113433404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112452 + ... + 1131271.

It is an arithmetic number, because the mean of its divisors is an integer number (2377786509).

Almost surely, 2^21113433430 is an apocalyptic number.

21113433430 is a deficient number, since it is larger than the sum of its proper divisors (16931150714).

21113433430 is a wasteful number, since it uses less digits than its factorization.

21113433430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244671.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21113433430 its reverse (3433431112), we get a palindrome (24546864542).

The spelling of 21113433430 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-three thousand, four hundred thirty".