20423021112111 has 16 divisors (see below), whose sum is σ = 28495132828416. Its totient is φ = 12986482350336.

The previous prime is 20423021112107. The next prime is 20423021112239. The reversal of 20423021112111 is 11121112032402.

It is not a de Polignac number, because 20423021112111 - 2² = 20423021112107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423021112101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419219005 + ... + 419267718.

It is an arithmetic number, because the mean of its divisors is an integer number (1780945801776).

Almost surely, 2^{20423021112111} is an apocalyptic number.

20423021112111 is a deficient number, since it is larger than the sum of its proper divisors (8072111716305).

20423021112111 is a wasteful number, since it uses less digits than its factorization.

20423021112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838487102.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 20423021112111 its reverse (11121112032402), we get a palindrome (31544133144513).

The spelling of 20423021112111 in words is "twenty trillion, four hundred twenty-three billion, twenty-one million, one hundred twelve thousand, one hundred eleven".