21020123230111 has 8 divisors (see below), whose sum is σ = 22322254759920. Its totient is φ = 19737572625792.

The previous prime is 21020123230103. The next prime is 21020123230151. The reversal of 21020123230111 is 11103232102012.

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 21020123230111 - 2³ = 21020123230103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020123230151) 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, 4895229160 + ... + 4895233453.

It is an arithmetic number, because the mean of its divisors is an integer number (2790281844990).

Almost surely, 2^{21020123230111} is an apocalyptic number.

21020123230111 is a deficient number, since it is larger than the sum of its proper divisors (1302131529809).

21020123230111 is a wasteful number, since it uses less digits than its factorization.

21020123230111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9790462745.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21020123230111 its reverse (11103232102012), we get a palindrome (32123355332123).

The spelling of 21020123230111 in words is "twenty-one trillion, twenty billion, one hundred twenty-three million, two hundred thirty thousand, one hundred eleven".