21831726434 has 24 divisors (see below), whose sum is σ = 39756843840. Its totient is φ = 8806072896.

The previous prime is 21831726419. The next prime is 21831726439. The reversal of 21831726434 is 43462713812.

It is a junction number, because it is equal to n+sod(n) for n = 21831726391 and 21831726400.

It is not an unprimeable number, because it can be changed into a prime (21831726439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2693894 + ... + 2701985.

It is an arithmetic number, because the mean of its divisors is an integer number (1656535160).

Almost surely, 2^21831726434 is an apocalyptic number.

21831726434 is a deficient number, since it is larger than the sum of its proper divisors (17925117406).

21831726434 is a wasteful number, since it uses less digits than its factorization.

21831726434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395922 (or 5395905 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The spelling of 21831726434 in words is "twenty-one billion, eight hundred thirty-one million, seven hundred twenty-six thousand, four hundred thirty-four".