22113036721 has 8 divisors (see below), whose sum is σ = 22680463104. Its totient is φ = 21549649440.

The previous prime is 22113036713. The next prime is 22113036727. The reversal of 22113036721 is 12763031122.

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

It is a cyclic number.

It is not a de Polignac number, because 22113036721 - 2³ = 22113036713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22113036721.

It is not an unprimeable number, because it can be changed into a prime (22113036727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998685 + ... + 1020586.

It is an arithmetic number, because the mean of its divisors is an integer number (2835057888).

Almost surely, 2^22113036721 is an apocalyptic number.

It is an amenable number.

22113036721 is a deficient number, since it is larger than the sum of its proper divisors (567426383).

22113036721 is a wasteful number, since it uses less digits than its factorization.

22113036721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019551.

The product of its (nonzero) digits is 3024, while the sum is 28.

Adding to 22113036721 its reverse (12763031122), we get a palindrome (34876067843).

The spelling of 22113036721 in words is "twenty-two billion, one hundred thirteen million, thirty-six thousand, seven hundred twenty-one".