20010111123021 has 32 divisors (see below), whose sum is σ = 26806197293568. Its totient is φ = 13277234096640.

The previous prime is 20010111123007. The next prime is 20010111123031. The reversal of 20010111123021 is 12032111101002.

It is not a de Polignac number, because 20010111123021 - 2¹⁹ = 20010110598733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010111123031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1103875260 + ... + 1103893386.

It is an arithmetic number, because the mean of its divisors is an integer number (837693665424).

Almost surely, 2^{20010111123021} is an apocalyptic number.

It is an amenable number.

20010111123021 is a deficient number, since it is larger than the sum of its proper divisors (6796086170547).

20010111123021 is a wasteful number, since it uses less digits than its factorization.

20010111123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20581.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20010111123021 its reverse (12032111101002), we get a palindrome (32042222224023).

The spelling of 20010111123021 in words is "twenty trillion, ten billion, one hundred eleven million, one hundred twenty-three thousand, twenty-one".