221421971481047 has 2 divisors, whose sum is σ = 221421971481048. Its totient is φ = 221421971481046.

The previous prime is 221421971481023. The next prime is 221421971481049. The reversal of 221421971481047 is 740184179124122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221421971481047 is a prime.

Together with 221421971481049, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221421971481047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221421971481049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710985740523 + 110710985740524.

It is an arithmetic number, because the mean of its divisors is an integer number (110710985740524).

Almost surely, 2^{221421971481047} is an apocalyptic number.

221421971481047 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421971481047 is an equidigital number, since it uses as much as digits as its factorization.

221421971481047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 221421971481047 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, nine hundred seventy-one million, four hundred eighty-one thousand, forty-seven".