221708543131 has 2 divisors, whose sum is σ = 221708543132. Its totient is φ = 221708543130.

The previous prime is 221708543117. The next prime is 221708543143. The reversal of 221708543131 is 131345807122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221708543131 - 2¹¹ = 221708541083 is a prime.

It is a super-2 number, since 2×221708543131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221708544131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110854271565 + 110854271566.

It is an arithmetic number, because the mean of its divisors is an integer number (110854271566).

Almost surely, 2^221708543131 is an apocalyptic number.

221708543131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221708543131 is an equidigital number, since it uses as much as digits as its factorization.

221708543131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 221708543131 in words is "two hundred twenty-one billion, seven hundred eight million, five hundred forty-three thousand, one hundred thirty-one".