21011313021023 has 8 divisors (see below), whose sum is σ = 22998511605216. Its totient is φ = 19077106399200.

The previous prime is 21011313020993. The next prime is 21011313021029. The reversal of 21011313021023 is 32012031311012.

It is a happy number.

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 21011313021023 - 2¹⁶ = 21011312955487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011313020986 and 21011313021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011313021029) 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, 13247989763 + ... + 13247991348.

It is an arithmetic number, because the mean of its divisors is an integer number (2874813950652).

Almost surely, 2^{21011313021023} is an apocalyptic number.

21011313021023 is a deficient number, since it is larger than the sum of its proper divisors (1987198584193).

21011313021023 is a wasteful number, since it uses less digits than its factorization.

21011313021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26495981185.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21011313021023 its reverse (32012031311012), we get a palindrome (53023344332035).

The spelling of 21011313021023 in words is "twenty-one trillion, eleven billion, three hundred thirteen million, twenty-one thousand, twenty-three".