1221441455055 has 32 divisors (see below), whose sum is σ = 1996861860864. Its totient is φ = 637263801216.

The previous prime is 1221441455023. The next prime is 1221441455161. The reversal of 1221441455055 is 5505541441221.

It is not a de Polignac number, because 1221441455055 - 2⁵ = 1221441455023 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1025412 + ... + 1869318.

It is an arithmetic number, because the mean of its divisors is an integer number (62401933152).

Almost surely, 2^{1221441455055} is an apocalyptic number.

1221441455055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221441455055 is a deficient number, since it is larger than the sum of its proper divisors (775420405809).

1221441455055 is a wasteful number, since it uses less digits than its factorization.

1221441455055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846015.

The product of its (nonzero) digits is 160000, while the sum is 39.

Adding to 1221441455055 its reverse (5505541441221), we get a palindrome (6726982896276).

The spelling of 1221441455055 in words is "one trillion, two hundred twenty-one billion, four hundred forty-one million, four hundred fifty-five thousand, fifty-five".