1221445430867 has 4 divisors (see below), whose sum is σ = 1221448574976. Its totient is φ = 1221442286760.

The previous prime is 1221445430833. The next prime is 1221445430899. The reversal of 1221445430867 is 7680345441221.

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 1221445430867 - 2⁴⁰ = 121933803091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221445430467) 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, 890963 + ... + 1799084.

It is an arithmetic number, because the mean of its divisors is an integer number (305362143744).

Almost surely, 2^{1221445430867} is an apocalyptic number.

1221445430867 is a deficient number, since it is larger than the sum of its proper divisors (3144109).

1221445430867 is an equidigital number, since it uses as much as digits as its factorization.

1221445430867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144108.

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 1221445430867 in words is "one trillion, two hundred twenty-one billion, four hundred forty-five million, four hundred thirty thousand, eight hundred sixty-seven".