21422221131 has 4 divisors (see below), whose sum is σ = 28562961512. Its totient is φ = 14281480752.

The previous prime is 21422221109. The next prime is 21422221157. The reversal of 21422221131 is 13112222412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21422221131 - 2⁹ = 21422220619 is a prime.

It is a super-2 number, since 2×21422221131² (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 = 21422221098 and 21422221107.

It is not an unprimeable number, because it can be changed into a prime (21422221181) 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, 3570370186 + ... + 3570370191.

It is an arithmetic number, because the mean of its divisors is an integer number (7140740378).

Almost surely, 2^21422221131 is an apocalyptic number.

21422221131 is a deficient number, since it is larger than the sum of its proper divisors (7140740381).

21422221131 is an equidigital number, since it uses as much as digits as its factorization.

21422221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7140740380.

The product of its digits is 384, while the sum is 21.

Adding to 21422221131 its reverse (13112222412), we get a palindrome (34534443543).

The spelling of 21422221131 in words is "twenty-one billion, four hundred twenty-two million, two hundred twenty-one thousand, one hundred thirty-one".