1221412165606 has 4 divisors (see below), whose sum is σ = 1832118248412. Its totient is φ = 610706082802.

The previous prime is 1221412165553. The next prime is 1221412165619. The reversal of 1221412165606 is 6065612141221.

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, 305353041400 + ... + 305353041403.

It is an arithmetic number, because the mean of its divisors is an integer number (458029562103).

Almost surely, 2^{1221412165606} is an apocalyptic number.

1221412165606 is a deficient number, since it is larger than the sum of its proper divisors (610706082806).

1221412165606 is an equidigital number, since it uses as much as digits as its factorization.

1221412165606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610706082805.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 1221412165606 in words is "one trillion, two hundred twenty-one billion, four hundred twelve million, one hundred sixty-five thousand, six hundred six".