21431112746 has 4 divisors (see below), whose sum is σ = 32146669122. Its totient is φ = 10715556372.

The previous prime is 21431112683. The next prime is 21431112761. The reversal of 21431112746 is 64721113412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20732832121 + 698280625 = 143989^2 + 26425^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357778185 + ... + 5357778188.

Almost surely, 2^21431112746 is an apocalyptic number.

21431112746 is a deficient number, since it is larger than the sum of its proper divisors (10715556376).

21431112746 is a wasteful number, since it uses less digits than its factorization.

21431112746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715556375.

The product of its digits is 8064, while the sum is 32.

The spelling of 21431112746 in words is "twenty-one billion, four hundred thirty-one million, one hundred twelve thousand, seven hundred forty-six".