21001231001223 has 24 divisors (see below), whose sum is σ = 33284137021200. Its totient is φ = 12654446415360.

The previous prime is 21001231001183. The next prime is 21001231001263. The reversal of 21001231001223 is 32210013210012.

21001231001223 is a `hidden beast` number, since 210 + 0 + 1 + 231 + 0 + 0 + 1 + 223 = 666.

It is an interprime number because it is at equal distance from previous prime (21001231001183) and next prime (21001231001263).

It is not a de Polignac number, because 21001231001223 - 2¹² = 21001230997127 is a prime.

It is a super-2 number, since 2×21001231001223² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001231001196 and 21001231001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001231001263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 613085898 + ... + 613120151.

It is an arithmetic number, because the mean of its divisors is an integer number (1386839042550).

Almost surely, 2^{21001231001223} is an apocalyptic number.

21001231001223 is a deficient number, since it is larger than the sum of its proper divisors (12282906019977).

21001231001223 is a wasteful number, since it uses less digits than its factorization.

21001231001223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226206239 (or 1226206236 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21001231001223 its reverse (32210013210012), we get a palindrome (53211244211235).

The spelling of 21001231001223 in words is "twenty-one trillion, one billion, two hundred thirty-one million, one thousand, two hundred twenty-three".