1221020221094 has 4 divisors (see below), whose sum is σ = 1831530331644. Its totient is φ = 610510110546.

The previous prime is 1221020221081. The next prime is 1221020221111. The reversal of 1221020221094 is 4901220201221.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305255055272 + ... + 305255055275.

It is an arithmetic number, because the mean of its divisors is an integer number (457882582911).

Almost surely, 2^{1221020221094} is an apocalyptic number.

1221020221094 is a deficient number, since it is larger than the sum of its proper divisors (610510110550).

1221020221094 is an equidigital number, since it uses as much as digits as its factorization.

1221020221094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610510110549.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 1221020221094 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, ninety-four".