21211023001223 has 4 divisors (see below), whose sum is σ = 23139297819528. Its totient is φ = 19282748182920.

The previous prime is 21211023001187. The next prime is 21211023001229. The reversal of 21211023001223 is 32210032011212.

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 21211023001223 - 2¹⁸ = 21211022739079 is a prime.

It is a super-2 number, since 2×21211023001223² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211023001195 and 21211023001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211023001229) 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, 964137409136 + ... + 964137409157.

It is an arithmetic number, because the mean of its divisors is an integer number (5784824454882).

Almost surely, 2^{21211023001223} is an apocalyptic number.

21211023001223 is a deficient number, since it is larger than the sum of its proper divisors (1928274818305).

21211023001223 is a wasteful number, since it uses less digits than its factorization.

21211023001223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928274818304.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21211023001223 its reverse (32210032011212), we get a palindrome (53421055012435).

The spelling of 21211023001223 in words is "twenty-one trillion, two hundred eleven billion, twenty-three million, one thousand, two hundred twenty-three".