21001231020023 has 8 divisors (see below), whose sum is σ = 21568926470688. Its totient is φ = 20433540549024.

The previous prime is 21001231020001. The next prime is 21001231020169. The reversal of 21001231020023 is 32002013210012.

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 21001231020023 - 2¹⁴ = 21001231003639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001231019983 and 21001231020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001231020823) 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, 8274590 + ... + 10510532.

It is an arithmetic number, because the mean of its divisors is an integer number (2696115808836).

Almost surely, 2^{21001231020023} is an apocalyptic number.

21001231020023 is a deficient number, since it is larger than the sum of its proper divisors (567695450665).

21001231020023 is a wasteful number, since it uses less digits than its factorization.

21001231020023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489833.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21001231020023 its reverse (32002013210012), we get a palindrome (53003244230035).

The spelling of 21001231020023 in words is "twenty-one trillion, one billion, two hundred thirty-one million, twenty thousand, twenty-three".