20111021123 has 8 divisors (see below), whose sum is σ = 20845393200. Its totient is φ = 19379375008.

The previous prime is 20111021059. The next prime is 20111021141. The reversal of 20111021123 is 32112011102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20111021123 - 2⁶ = 20111021059 is a prime.

It is a super-2 number, since 2×20111021123² (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 = 20111021098 and 20111021107.

It is not an unprimeable number, because it can be changed into a prime (20111021153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666461 + ... + 695982.

It is an arithmetic number, because the mean of its divisors is an integer number (2605674150).

Almost surely, 2^20111021123 is an apocalyptic number.

20111021123 is a deficient number, since it is larger than the sum of its proper divisors (734372077).

20111021123 is a wasteful number, since it uses less digits than its factorization.

20111021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362981.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20111021123 its reverse (32112011102), we get a palindrome (52223032225).

The spelling of 20111021123 in words is "twenty billion, one hundred eleven million, twenty-one thousand, one hundred twenty-three".