21004425404311 has 16 divisors (see below), whose sum is σ = 21288220208640. Its totient is φ = 20721378233920.

The previous prime is 21004425404267. The next prime is 21004425404321. The reversal of 21004425404311 is 11340452440012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004425404311 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 (21004425404321) 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, 224448216 + ... + 224541778.

It is an arithmetic number, because the mean of its divisors is an integer number (1330513763040).

Almost surely, 2^{21004425404311} is an apocalyptic number.

21004425404311 is a deficient number, since it is larger than the sum of its proper divisors (283794804329).

21004425404311 is an equidigital number, since it uses as much as digits as its factorization.

21004425404311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97526.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 21004425404311 its reverse (11340452440012), we get a palindrome (32344877844323).

The spelling of 21004425404311 in words is "twenty-one trillion, four billion, four hundred twenty-five million, four hundred four thousand, three hundred eleven".