21403106572 has 12 divisors (see below), whose sum is σ = 37471873096. Its totient is φ = 10696857120.

The previous prime is 21403106561. The next prime is 21403106587. The reversal of 21403106572 is 27560130412.

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, 1163778 + ... + 1182025.

Almost surely, 2^21403106572 is an apocalyptic number.

It is an amenable number.

21403106572 is a deficient number, since it is larger than the sum of its proper divisors (16068766524).

21403106572 is a wasteful number, since it uses less digits than its factorization.

21403106572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348088 (or 2348086 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 21403106572 its reverse (27560130412), we get a palindrome (48963236984).

The spelling of 21403106572 in words is "twenty-one billion, four hundred three million, one hundred six thousand, five hundred seventy-two".