20221210123 has 4 divisors (see below), whose sum is σ = 21285484360. Its totient is φ = 19156935888.

The previous prime is 20221210073. The next prime is 20221210153. The reversal of 20221210123 is 32101212202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32101212202 = 2 ⋅16050606101.

It is a cyclic number.

It is not a de Polignac number, because 20221210123 - 2⁹ = 20221209611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221210097 and 20221210106.

It is not an unprimeable number, because it can be changed into a prime (20221210153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532137090 + ... + 532137127.

It is an arithmetic number, because the mean of its divisors is an integer number (5321371090).

Almost surely, 2^20221210123 is an apocalyptic number.

20221210123 is a deficient number, since it is larger than the sum of its proper divisors (1064274237).

20221210123 is a wasteful number, since it uses less digits than its factorization.

20221210123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064274236.

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

Adding to 20221210123 its reverse (32101212202), we get a palindrome (52322422325).

The spelling of 20221210123 in words is "twenty billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-three".