21224355131 has 4 divisors (see below), whose sum is σ = 24256405872. Its totient is φ = 18192304392.

The previous prime is 21224355121. The next prime is 21224355161. The reversal of 21224355131 is 13155342212.

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 21224355131 - 2²⁶ = 21157246267 is a prime.

It is a super-2 number, since 2×21224355131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21224355094 and 21224355103.

It is not an unprimeable number, because it can be changed into a prime (21224355101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516025360 + ... + 1516025373.

It is an arithmetic number, because the mean of its divisors is an integer number (6064101468).

Almost surely, 2^21224355131 is an apocalyptic number.

21224355131 is a deficient number, since it is larger than the sum of its proper divisors (3032050741).

21224355131 is an equidigital number, since it uses as much as digits as its factorization.

21224355131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032050740.

The product of its digits is 7200, while the sum is 29.

Adding to 21224355131 its reverse (13155342212), we get a palindrome (34379697343).

The spelling of 21224355131 in words is "twenty-one billion, two hundred twenty-four million, three hundred fifty-five thousand, one hundred thirty-one".