21254004634 has 8 divisors (see below), whose sum is σ = 33267137760. Its totient is φ = 10164958716.

The previous prime is 21254004623. The next prime is 21254004647. The reversal of 21254004634 is 43640045212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21254004596 and 21254004605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231021744 + ... + 231021835.

It is an arithmetic number, because the mean of its divisors is an integer number (4158392220).

Almost surely, 2^21254004634 is an apocalyptic number.

21254004634 is a deficient number, since it is larger than the sum of its proper divisors (12013133126).

21254004634 is a wasteful number, since it uses less digits than its factorization.

21254004634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462043604.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 21254004634 its reverse (43640045212), we get a palindrome (64894049846).

The spelling of 21254004634 in words is "twenty-one billion, two hundred fifty-four million, four thousand, six hundred thirty-four".