20011221223 has 8 divisors (see below), whose sum is σ = 22876274048. Its totient is φ = 17147745144.

The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221223 is 32212211002.

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 not a de Polignac number, because 20011221223 - 2²¹ = 20009124071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011221197 and 20011221206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221253) 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, 366861 + ... + 417862.

It is an arithmetic number, because the mean of its divisors is an integer number (2859534256).

Almost surely, 2^20011221223 is an apocalyptic number.

20011221223 is a deficient number, since it is larger than the sum of its proper divisors (2865052825).

20011221223 is an equidigital number, since it uses as much as digits as its factorization.

20011221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788373.

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

Adding to 20011221223 its reverse (32212211002), we get a palindrome (52223432225).

The spelling of 20011221223 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred twenty-three".