1221055152244 has 12 divisors (see below), whose sum is σ = 2137040799264. Its totient is φ = 610472066744.

The previous prime is 1221055152241. The next prime is 1221055152253. The reversal of 1221055152244 is 4422515501221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221055152241) 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, 13827832 + ... + 13915855.

It is an arithmetic number, because the mean of its divisors is an integer number (178086733272).

Almost surely, 2^{1221055152244} is an apocalyptic number.

It is an amenable number.

1221055152244 is a deficient number, since it is larger than the sum of its proper divisors (915985647020).

1221055152244 is a wasteful number, since it uses less digits than its factorization.

1221055152244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27754694 (or 27754692 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

The spelling of 1221055152244 in words is "one trillion, two hundred twenty-one billion, fifty-five million, one hundred fifty-two thousand, two hundred forty-four".