21021301131223 has 16 divisors (see below), whose sum is σ = 22049566050240. Its totient is φ = 20002566887424.

The previous prime is 21021301131203. The next prime is 21021301131247. The reversal of 21021301131223 is 32213110312012.

It is a cyclic number.

It is not a de Polignac number, because 21021301131223 - 2²⁵ = 21021267576791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021301131194 and 21021301131203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021301131203) 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, 297257793 + ... + 297328501.

It is an arithmetic number, because the mean of its divisors is an integer number (1378097878140).

Almost surely, 2^{21021301131223} is an apocalyptic number.

21021301131223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21021301131223 is a deficient number, since it is larger than the sum of its proper divisors (1028264919017).

21021301131223 is a wasteful number, since it uses less digits than its factorization.

21021301131223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137898.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21021301131223 its reverse (32213110312012), we get a palindrome (53234411443235).

The spelling of 21021301131223 in words is "twenty-one trillion, twenty-one billion, three hundred one million, one hundred thirty-one thousand, two hundred twenty-three".