1221222805447 has 4 divisors (see below), whose sum is σ = 1221225241456. Its totient is φ = 1221220369440.

The previous prime is 1221222805427. The next prime is 1221222805459. The reversal of 1221222805447 is 7445082221221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221222805447 - 2¹⁹ = 1221222281159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222805427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159243 + ... + 1570924.

It is an arithmetic number, because the mean of its divisors is an integer number (305306310364).

Almost surely, 2^{1221222805447} is an apocalyptic number.

1221222805447 is a deficient number, since it is larger than the sum of its proper divisors (2436009).

1221222805447 is an equidigital number, since it uses as much as digits as its factorization.

1221222805447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436008.

The product of its (nonzero) digits is 143360, while the sum is 40.

The spelling of 1221222805447 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, eight hundred five thousand, four hundred forty-seven".