21234040000 has 70 divisors (see below), whose sum is σ = 52653617324. Its totient is φ = 8493600000.

The previous prime is 21234039977. The next prime is 21234040031. The reversal of 21234040000 is 4043212.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 225426 + ... + 305425.

Almost surely, 2^21234040000 is an apocalyptic number.

21234040000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234040000 is an abundant number, since it is smaller than the sum of its proper divisors (31419577324).

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

21234040000 is an frugal number, since it uses more digits than its factorization.

21234040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530883 (or 530858 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21234040000 its reverse (4043212), we get a palindrome (21238083212).

The spelling of 21234040000 in words is "twenty-one billion, two hundred thirty-four million, forty thousand".