221447230531 has 2 divisors, whose sum is σ = 221447230532. Its totient is φ = 221447230530.

The previous prime is 221447230523. The next prime is 221447230547. The reversal of 221447230531 is 135032744122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221447230531 - 2³ = 221447230523 is a prime.

It is a super-2 number, since 2×221447230531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221447230031) 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, 110723615265 + 110723615266.

It is an arithmetic number, because the mean of its divisors is an integer number (110723615266).

Almost surely, 2^221447230531 is an apocalyptic number.

221447230531 is a deficient number, since it is larger than the sum of its proper divisors (1).

221447230531 is an equidigital number, since it uses as much as digits as its factorization.

221447230531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

Adding to 221447230531 its reverse (135032744122), we get a palindrome (356479974653).

The spelling of 221447230531 in words is "two hundred twenty-one billion, four hundred forty-seven million, two hundred thirty thousand, five hundred thirty-one".