21124404022231 has 4 divisors (see below), whose sum is σ = 21215066700672. Its totient is φ = 21033741343792.

The previous prime is 21124404022207. The next prime is 21124404022273. The reversal of 21124404022231 is 13222040442112.

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 21124404022231 - 2⁷ = 21124404022103 is a prime.

It is a super-2 number, since 2×21124404022231² (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 21124404022231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124474022231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45331338871 + ... + 45331339336.

It is an arithmetic number, because the mean of its divisors is an integer number (5303766675168).

Almost surely, 2^{21124404022231} is an apocalyptic number.

21124404022231 is a deficient number, since it is larger than the sum of its proper divisors (90662678441).

21124404022231 is an equidigital number, since it uses as much as digits as its factorization.

21124404022231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90662678440.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21124404022231 its reverse (13222040442112), we get a palindrome (34346444464343).

The spelling of 21124404022231 in words is "twenty-one trillion, one hundred twenty-four billion, four hundred four million, twenty-two thousand, two hundred thirty-one".