20123212122 has 48 divisors (see below), whose sum is σ = 47032876800. Its totient is φ = 6181377696.

The previous prime is 20123212117. The next prime is 20123212129. The reversal of 20123212122 is 22121232102.

It is a super-2 number, since 2×20123212122² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20123212095 and 20123212104.

It is not an unprimeable number, because it can be changed into a prime (20123212129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68383 + ... + 211949.

It is an arithmetic number, because the mean of its divisors is an integer number (979851600).

Almost surely, 2^20123212122 is an apocalyptic number.

20123212122 is an abundant number, since it is smaller than the sum of its proper divisors (26909664678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20123212122 is a wasteful number, since it uses less digits than its factorization.

20123212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144187 (or 144184 counting only the distinct ones).

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

Adding to 20123212122 its reverse (22121232102), we get a palindrome (42244444224).

The spelling of 20123212122 in words is "twenty billion, one hundred twenty-three million, two hundred twelve thousand, one hundred twenty-two".