21406234413 has 8 divisors (see below), whose sum is σ = 28835890048. Its totient is φ = 14123700864.

The previous prime is 21406234397. The next prime is 21406234427. The reversal of 21406234413 is 31443260412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21406234413 - 2⁴ = 21406234397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21406234433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36780181 + ... + 36780762.

It is an arithmetic number, because the mean of its divisors is an integer number (3604486256).

Almost surely, 2^21406234413 is an apocalyptic number.

It is an amenable number.

21406234413 is a deficient number, since it is larger than the sum of its proper divisors (7429655635).

21406234413 is an equidigital number, since it uses as much as digits as its factorization.

21406234413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73561043.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 21406234413 its reverse (31443260412), we get a palindrome (52849494825).

The spelling of 21406234413 in words is "twenty-one billion, four hundred six million, two hundred thirty-four thousand, four hundred thirteen".