21223004420231 has 4 divisors (see below), whose sum is σ = 21224691073872. Its totient is φ = 21221317766592.

The previous prime is 21223004420213. The next prime is 21223004420251. The reversal of 21223004420231 is 13202440032212.

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 21223004420231 - 2³⁸ = 20948126513287 is a prime.

It is a super-2 number, since 2×21223004420231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21223004420231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223004420251) 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, 843307946 + ... + 843333111.

It is an arithmetic number, because the mean of its divisors is an integer number (5306172768468).

Almost surely, 2^{21223004420231} is an apocalyptic number.

21223004420231 is a deficient number, since it is larger than the sum of its proper divisors (1686653641).

21223004420231 is a wasteful number, since it uses less digits than its factorization.

21223004420231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686653640.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21223004420231 its reverse (13202440032212), we get a palindrome (34425444452443).

The spelling of 21223004420231 in words is "twenty-one trillion, two hundred twenty-three billion, four million, four hundred twenty thousand, two hundred thirty-one".