21223457526 has 32 divisors (see below), whose sum is σ = 45045341568. Its totient is φ = 6643295360.

The previous prime is 21223457503. The next prime is 21223457551. The reversal of 21223457526 is 62575432212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189660 + ... + 280031.

It is an arithmetic number, because the mean of its divisors is an integer number (1407666924).

Almost surely, 2^21223457526 is an apocalyptic number.

21223457526 is an abundant number, since it is smaller than the sum of its proper divisors (23821884042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223457526 is a wasteful number, since it uses less digits than its factorization.

21223457526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470156.

The product of its digits is 201600, while the sum is 39.

Adding to 21223457526 its reverse (62575432212), we get a palindrome (83798889738).

The spelling of 21223457526 in words is "twenty-one billion, two hundred twenty-three million, four hundred fifty-seven thousand, five hundred twenty-six".