21010265023 has 4 divisors (see below), whose sum is σ = 22920289128. Its totient is φ = 19100240920.

The previous prime is 21010265021. The next prime is 21010265041. The reversal of 21010265023 is 32056201012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21010265023 - 2¹ = 21010265021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010264985 and 21010265003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010265021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955012036 + ... + 955012057.

It is an arithmetic number, because the mean of its divisors is an integer number (5730072282).

Almost surely, 2^21010265023 is an apocalyptic number.

21010265023 is a deficient number, since it is larger than the sum of its proper divisors (1910024105).

21010265023 is a wasteful number, since it uses less digits than its factorization.

21010265023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910024104.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21010265023 its reverse (32056201012), we get a palindrome (53066466035).

The spelling of 21010265023 in words is "twenty-one billion, ten million, two hundred sixty-five thousand, twenty-three".