221995514843 has 2 divisors, whose sum is σ = 221995514844. Its totient is φ = 221995514842.

The previous prime is 221995514801. The next prime is 221995514929. The reversal of 221995514843 is 348415599122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221995514843 - 2¹⁶ = 221995449307 is a prime.

It is a super-2 number, since 2×221995514843² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221994514843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110997757421 + 110997757422.

It is an arithmetic number, because the mean of its divisors is an integer number (110997757422).

Almost surely, 2^221995514843 is an apocalyptic number.

221995514843 is a deficient number, since it is larger than the sum of its proper divisors (1).

221995514843 is an equidigital number, since it uses as much as digits as its factorization.

221995514843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 53.

Adding to 221995514843 its sum of digits (53), we get a square (221995514896 = 471164²).

The spelling of 221995514843 in words is "two hundred twenty-one billion, nine hundred ninety-five million, five hundred fourteen thousand, eight hundred forty-three".