21431430404 has 12 divisors (see below), whose sum is σ = 37665970524. Its totient is φ = 10669724544.

The previous prime is 21431430403. The next prime is 21431430491. The reversal of 21431430404 is 40403413412.

It can be written as a sum of positive squares in 2 ways, for example, as 9652669504 + 11778760900 = 98248^2 + 108530^2 .

It is a super-2 number, since 2×21431430404² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21431430401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11496617 + ... + 11498480.

It is an arithmetic number, because the mean of its divisors is an integer number (3138830877).

Almost surely, 2^21431430404 is an apocalyptic number.

It is an amenable number.

21431430404 is a deficient number, since it is larger than the sum of its proper divisors (16234540120).

21431430404 is a wasteful number, since it uses less digits than its factorization.

21431430404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22995334 (or 22995332 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21431430404 its reverse (40403413412), we get a palindrome (61834843816).

The spelling of 21431430404 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty thousand, four hundred four".