21404489436 has 60 divisors (see below), whose sum is σ = 61042443000. Its totient is φ = 6486207840.

The previous prime is 21404489417. The next prime is 21404489437. The reversal of 21404489436 is 63498440412.

It is a junction number, because it is equal to n+sod(n) for n = 21404489391 and 21404489400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404489437) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2999311 + ... + 3006438.

It is an arithmetic number, because the mean of its divisors is an integer number (1017374050).

Almost surely, 2^21404489436 is an apocalyptic number.

It is an amenable number.

21404489436 is an abundant number, since it is smaller than the sum of its proper divisors (39637953564).

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

21404489436 is a wasteful number, since it uses less digits than its factorization.

21404489436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6005776 (or 6005765 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 21404489436 in words is "twenty-one billion, four hundred four million, four hundred eighty-nine thousand, four hundred thirty-six".