21265220422 has 8 divisors (see below), whose sum is σ = 32499676656. Its totient is φ = 10431994872.

The previous prime is 21265220399. The next prime is 21265220447. The reversal of 21265220422 is 22402256212.

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

It is a congruent number.

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, 100307538 + ... + 100307749.

It is an arithmetic number, because the mean of its divisors is an integer number (4062459582).

Almost surely, 2^21265220422 is an apocalyptic number.

21265220422 is a deficient number, since it is larger than the sum of its proper divisors (11234456234).

21265220422 is a wasteful number, since it uses less digits than its factorization.

21265220422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200615342.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21265220422 its reverse (22402256212), we get a palindrome (43667476634).

The spelling of 21265220422 in words is "twenty-one billion, two hundred sixty-five million, two hundred twenty thousand, four hundred twenty-two".