21122120223 has 16 divisors (see below), whose sum is σ = 31328492800. Its totient is φ = 14065005240.

The previous prime is 21122120209. The next prime is 21122120231. The reversal of 21122120223 is 32202122112.

It is not a de Polignac number, because 21122120223 - 2⁴ = 21122120207 is a prime.

It is a super-2 number, since 2×21122120223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122120196 and 21122120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122120293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432163 + ... + 478548.

It is an arithmetic number, because the mean of its divisors is an integer number (1958030800).

Almost surely, 2^21122120223 is an apocalyptic number.

21122120223 is a deficient number, since it is larger than the sum of its proper divisors (10206372577).

21122120223 is an equidigital number, since it uses as much as digits as its factorization.

21122120223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911579 (or 911573 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21122120223 its reverse (32202122112), we get a palindrome (53324242335).

The spelling of 21122120223 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, two hundred twenty-three".