21226604572 has 24 divisors (see below), whose sum is σ = 37243036656. Its totient is φ = 10585774848.

The previous prime is 21226604543. The next prime is 21226604587. The reversal of 21226604572 is 27540662212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2719908 + ... + 2727700.

It is an arithmetic number, because the mean of its divisors is an integer number (1551793194).

Almost surely, 2^21226604572 is an apocalyptic number.

It is an amenable number.

21226604572 is a deficient number, since it is larger than the sum of its proper divisors (16016432084).

21226604572 is a wasteful number, since it uses less digits than its factorization.

21226604572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9477 (or 9475 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 21226604572 in words is "twenty-one billion, two hundred twenty-six million, six hundred four thousand, five hundred seventy-two".