21432221404 has 24 divisors (see below), whose sum is σ = 40923525888. Its totient is φ = 9740141040.

The previous prime is 21432221303. The next prime is 21432221413. The reversal of 21432221404 is 40412223412.

It is a super-2 number, since 2×21432221404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216637 + ... + 299659.

It is an arithmetic number, because the mean of its divisors is an integer number (1705146912).

Almost surely, 2^21432221404 is an apocalyptic number.

It is an amenable number.

21432221404 is a deficient number, since it is larger than the sum of its proper divisors (19491304484).

21432221404 is a wasteful number, since it uses less digits than its factorization.

21432221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88905 (or 88903 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21432221404 its reverse (40412223412), we get a palindrome (61844444816).

The spelling of 21432221404 in words is "twenty-one billion, four hundred thirty-two million, two hundred twenty-one thousand, four hundred four".