21120012430 has 32 divisors (see below), whose sum is σ = 43275161088. Its totient is φ = 7346090400.

The previous prime is 21120012427. The next prime is 21120012437. The reversal of 21120012430 is 3421002112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120012437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4171386 + ... + 4176445.

It is an arithmetic number, because the mean of its divisors is an integer number (1352348784).

Almost surely, 2^21120012430 is an apocalyptic number.

21120012430 is an abundant number, since it is smaller than the sum of its proper divisors (22155148658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120012430 is a wasteful number, since it uses less digits than its factorization.

21120012430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8347872.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21120012430 its reverse (3421002112), we get a palindrome (24541014542).

The spelling of 21120012430 in words is "twenty-one billion, one hundred twenty million, twelve thousand, four hundred thirty".