20023121105 has 16 divisors (see below), whose sum is σ = 25897294080. Its totient is φ = 14774155968.

The previous prime is 20023121059. The next prime is 20023121149. The reversal of 20023121105 is 50112132002.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20023121105 is a prime.

It is a super-3 number, since 3×20023121105³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46445 + ... + 205434.

It is an arithmetic number, because the mean of its divisors is an integer number (1618580880).

Almost surely, 2^20023121105 is an apocalyptic number.

It is an amenable number.

20023121105 is a deficient number, since it is larger than the sum of its proper divisors (5874172975).

20023121105 is a wasteful number, since it uses less digits than its factorization.

20023121105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253120.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20023121105 its reverse (50112132002), we get a palindrome (70135253107).

The spelling of 20023121105 in words is "twenty billion, twenty-three million, one hundred twenty-one thousand, one hundred five".