21204231001404 has 72 divisors (see below), whose sum is σ = 54386812397904. Its totient is φ = 6425109926400.

The previous prime is 21204231001399. The next prime is 21204231001409. The reversal of 21204231001404 is 40410013240212.

It is an interprime number because it is at equal distance from previous prime (21204231001399) and next prime (21204231001409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204231001409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22421694 + ... + 23348250.

Almost surely, 2^{21204231001404} is an apocalyptic number.

It is an amenable number.

21204231001404 is an abundant number, since it is smaller than the sum of its proper divisors (33182581396500).

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

21204231001404 is a wasteful number, since it uses less digits than its factorization.

21204231001404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942347 (or 942334 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21204231001404 its reverse (40410013240212), we get a palindrome (61614244241616).

The spelling of 21204231001404 in words is "twenty-one trillion, two hundred four billion, two hundred thirty-one million, one thousand, four hundred four".