1221892228366 has 4 divisors (see below), whose sum is σ = 1832838342552. Its totient is φ = 610946114182.

The previous prime is 1221892228343. The next prime is 1221892228457. The reversal of 1221892228366 is 6638222981221.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 305473057090 + ... + 305473057093.

It is an arithmetic number, because the mean of its divisors is an integer number (458209585638).

Almost surely, 2^{1221892228366} is an apocalyptic number.

1221892228366 is a deficient number, since it is larger than the sum of its proper divisors (610946114186).

1221892228366 is an equidigital number, since it uses as much as digits as its factorization.

1221892228366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610946114185.

The product of its digits is 1990656, while the sum is 52.

The spelling of 1221892228366 in words is "one trillion, two hundred twenty-one billion, eight hundred ninety-two million, two hundred twenty-eight thousand, three hundred sixty-six".