21234454410 has 64 divisors (see below), whose sum is σ = 55782679680. Its totient is φ = 5141249280.

The previous prime is 21234454391. The next prime is 21234454421. The reversal of 21234454410 is 1445443212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 422500 + ... + 470079.

It is an arithmetic number, because the mean of its divisors is an integer number (871604370).

Almost surely, 2^21234454410 is an apocalyptic number.

21234454410 is an abundant number, since it is smaller than the sum of its proper divisors (34548225270).

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

21234454410 is a wasteful number, since it uses less digits than its factorization.

21234454410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892663.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21234454410 its reverse (1445443212), we get a palindrome (22679897622).

The spelling of 21234454410 in words is "twenty-one billion, two hundred thirty-four million, four hundred fifty-four thousand, four hundred ten".