1221220055246 has 32 divisors (see below), whose sum is σ = 1989418167072. Its totient is φ = 559961994240.

The previous prime is 1221220055239. The next prime is 1221220055291. The reversal of 1221220055246 is 6425500221221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540500 + ... + 1653656.

It is an arithmetic number, because the mean of its divisors is an integer number (62169317721).

Almost surely, 2^{1221220055246} is an apocalyptic number.

1221220055246 is a deficient number, since it is larger than the sum of its proper divisors (768198111826).

1221220055246 is a wasteful number, since it uses less digits than its factorization.

1221220055246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114004.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 1221220055246 its reverse (6425500221221), we get a palindrome (7646720276467).

The spelling of 1221220055246 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, fifty-five thousand, two hundred forty-six".