221396787247 has 2 divisors, whose sum is σ = 221396787248. Its totient is φ = 221396787246.

The previous prime is 221396787223. The next prime is 221396787277. The reversal of 221396787247 is 742787693122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221396787247 - 2³¹ = 219249303599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221396787191 and 221396787200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221396787277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110698393623 + 110698393624.

It is an arithmetic number, because the mean of its divisors is an integer number (110698393624).

Almost surely, 2^221396787247 is an apocalyptic number.

221396787247 is a deficient number, since it is larger than the sum of its proper divisors (1).

221396787247 is an equidigital number, since it uses as much as digits as its factorization.

221396787247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 58.

The spelling of 221396787247 in words is "two hundred twenty-one billion, three hundred ninety-six million, seven hundred eighty-seven thousand, two hundred forty-seven".