1021355442225 has 72 divisors (see below), whose sum is σ = 1834176917664. Its totient is φ = 543290880000.

The previous prime is 1021355442223. The next prime is 1021355442241. The reversal of 1021355442225 is 5222445531201.

1021355442225 is a `hidden beast` number, since 10 + 213 + 5 + 5 + 4 + 422 + 2 + 5 = 666.

It is not a de Polignac number, because 1021355442225 - 2¹ = 1021355442223 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021355442225.

It is not an unprimeable number, because it can be changed into a prime (1021355442223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 157346230 + ... + 157352720.

It is an arithmetic number, because the mean of its divisors is an integer number (25474679412).

Almost surely, 2^{1021355442225} is an apocalyptic number.

1021355442225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021355442225 is a deficient number, since it is larger than the sum of its proper divisors (812821475439).

1021355442225 is a wasteful number, since it uses less digits than its factorization.

1021355442225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8239 (or 8231 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 1021355442225 in words is "one trillion, twenty-one billion, three hundred fifty-five million, four hundred forty-two thousand, two hundred twenty-five".