21404331413 has 8 divisors (see below), whose sum is σ = 21706374816. Its totient is φ = 21103339600.

The previous prime is 21404331379. The next prime is 21404331437. The reversal of 21404331413 is 31413340412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21404331413 - 2⁶ = 21404331349 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 (21404331713) 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, 221858 + ... + 303363.

It is an arithmetic number, because the mean of its divisors is an integer number (2713296852).

Almost surely, 2^21404331413 is an apocalyptic number.

It is an amenable number.

21404331413 is a deficient number, since it is larger than the sum of its proper divisors (302043403).

21404331413 is an equidigital number, since it uses as much as digits as its factorization.

21404331413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525795.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21404331413 its reverse (31413340412), we get a palindrome (52817671825).

The spelling of 21404331413 in words is "twenty-one billion, four hundred four million, three hundred thirty-one thousand, four hundred thirteen".