21220101223 has 8 divisors (see below), whose sum is σ = 21334917200. Its totient is φ = 21105335808.

The previous prime is 21220101211. The next prime is 21220101229. The reversal of 21220101223 is 32210102212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220101223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220101197 and 21220101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220101229) 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, 1082473 + ... + 1101901.

It is an arithmetic number, because the mean of its divisors is an integer number (2666864650).

Almost surely, 2^21220101223 is an apocalyptic number.

21220101223 is a deficient number, since it is larger than the sum of its proper divisors (114815977).

21220101223 is a wasteful number, since it uses less digits than its factorization.

21220101223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25281.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21220101223 its reverse (32210102212), we get a palindrome (53430203435).

The spelling of 21220101223 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, two hundred twenty-three".