2221421543531 has 2 divisors, whose sum is σ = 2221421543532. Its totient is φ = 2221421543530.

The previous prime is 2221421543513. The next prime is 2221421543569. The reversal of 2221421543531 is 1353451241222.

Together with previous prime (2221421543513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221421543531 - 2¹⁴ = 2221421527147 is a prime.

It is a super-2 number, since 2×2221421543531² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2221421543491 and 2221421543500.

It is not a weakly prime, because it can be changed into another prime (2221421549531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110710771765 + 1110710771766.

It is an arithmetic number, because the mean of its divisors is an integer number (1110710771766).

Almost surely, 2^{2221421543531} is an apocalyptic number.

2221421543531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221421543531 is an equidigital number, since it uses as much as digits as its factorization.

2221421543531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 35.

Adding to 2221421543531 its reverse (1353451241222), we get a palindrome (3574872784753).

The spelling of 2221421543531 in words is "two trillion, two hundred twenty-one billion, four hundred twenty-one million, five hundred forty-three thousand, five hundred thirty-one".