1055105221221 has 24 divisors (see below), whose sum is σ = 1623590317440. Its totient is φ = 657965275776.

The previous prime is 1055105221151. The next prime is 1055105221229. The reversal of 1055105221221 is 1221225015501.

1055105221221 is a `hidden beast` number, since 1 + 0 + 5 + 5 + 10 + 522 + 122 + 1 = 666.

It is not a de Polignac number, because 1055105221221 - 2⁹ = 1055105220709 is a prime.

It is a super-2 number, since 2×1055105221221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055105221229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21128781 + ... + 21178658.

It is an arithmetic number, because the mean of its divisors is an integer number (67649596560).

Almost surely, 2^{1055105221221} is an apocalyptic number.

It is an amenable number.

1055105221221 is a deficient number, since it is larger than the sum of its proper divisors (568485096219).

1055105221221 is a wasteful number, since it uses less digits than its factorization.

1055105221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42307625 (or 42307622 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 1055105221221 in words is "one trillion, fifty-five billion, one hundred five million, two hundred twenty-one thousand, two hundred twenty-one".