21423322021231 has 4 divisors (see below), whose sum is σ = 23071269869032. Its totient is φ = 19775374173432.

The previous prime is 21423322021193. The next prime is 21423322021253. The reversal of 21423322021231 is 13212022332412.

It is a happy number.

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 21423322021231 - 2⁹ = 21423322020719 is a prime.

It is a super-2 number, since 2×21423322021231² (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 21423322021231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423322021831) 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, 823973923881 + ... + 823973923906.

It is an arithmetic number, because the mean of its divisors is an integer number (5767817467258).

Almost surely, 2^{21423322021231} is an apocalyptic number.

21423322021231 is a deficient number, since it is larger than the sum of its proper divisors (1647947847801).

21423322021231 is a wasteful number, since it uses less digits than its factorization.

21423322021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647947847800.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21423322021231 its reverse (13212022332412), we get a palindrome (34635344353643).

The spelling of 21423322021231 in words is "twenty-one trillion, four hundred twenty-three billion, three hundred twenty-two million, twenty-one thousand, two hundred thirty-one".