20121012220123 has 4 divisors (see below), whose sum is σ = 20122427114608. Its totient is φ = 20119597325640.

The previous prime is 20121012220117. The next prime is 20121012220129. The reversal of 20121012220123 is 32102221012102.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20121012220117) and next prime (20121012220129).

It is a cyclic number.

It is not a de Polignac number, because 20121012220123 - 2²⁵ = 20120978665691 is a prime.

It is a super-2 number, since 2×20121012220123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121012220123.

It is not an unprimeable number, because it can be changed into a prime (20121012220129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707425911 + ... + 707454352.

It is an arithmetic number, because the mean of its divisors is an integer number (5030606778652).

Almost surely, 2^{20121012220123} is an apocalyptic number.

20121012220123 is a deficient number, since it is larger than the sum of its proper divisors (1414894485).

20121012220123 is a wasteful number, since it uses less digits than its factorization.

20121012220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414894484.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20121012220123 its reverse (32102221012102), we get a palindrome (52223233232225).

The spelling of 20121012220123 in words is "twenty trillion, one hundred twenty-one billion, twelve million, two hundred twenty thousand, one hundred twenty-three".