221321768047 has 2 divisors, whose sum is σ = 221321768048. Its totient is φ = 221321768046.

The previous prime is 221321768029. The next prime is 221321768069. The reversal of 221321768047 is 740867123122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221321768047 - 2¹⁵ = 221321735279 is a prime.

It is a super-2 number, since 2×221321768047² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221321767994 and 221321768012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221321768347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660884023 + 110660884024.

It is an arithmetic number, because the mean of its divisors is an integer number (110660884024).

Almost surely, 2^221321768047 is an apocalyptic number.

221321768047 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321768047 is an equidigital number, since it uses as much as digits as its factorization.

221321768047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 221321768047 in words is "two hundred twenty-one billion, three hundred twenty-one million, seven hundred sixty-eight thousand, forty-seven".