1023120553221 has 32 divisors (see below), whose sum is σ = 1652481344640. Its totient is φ = 629612630640.

The previous prime is 1023120553219. The next prime is 1023120553237. The reversal of 1023120553221 is 1223550213201.

1023120553221 is a `hidden beast` number, since 1 + 0 + 2 + 3 + 120 + 5 + 532 + 2 + 1 = 666.

It is not a de Polignac number, because 1023120553221 - 2¹ = 1023120553219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023120553321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17964615 + ... + 18021476.

It is an arithmetic number, because the mean of its divisors is an integer number (51640042020).

Almost surely, 2^{1023120553221} is an apocalyptic number.

It is an amenable number.

1023120553221 is a deficient number, since it is larger than the sum of its proper divisors (629360791419).

1023120553221 is an frugal number, since it uses more digits than its factorization.

1023120553221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35986125 (or 35986107 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 1023120553221 its reverse (1223550213201), we get a palindrome (2246670766422).

The spelling of 1023120553221 in words is "one trillion, twenty-three billion, one hundred twenty million, five hundred fifty-three thousand, two hundred twenty-one".