1253535403221 has 12 divisors (see below), whose sum is σ = 1812594664972. Its totient is φ = 834798384576.

The previous prime is 1253535403213. The next prime is 1253535403231. The reversal of 1253535403221 is 1223045353521.

1253535403221 is a `hidden beast` number, since 1 + 2 + 53 + 535 + 40 + 32 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 117296660196 + 1136238743025 = 342486^2 + 1065945^2 .

It is not a de Polignac number, because 1253535403221 - 2³ = 1253535403213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253535403231) 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 11 ways as a sum of consecutive naturals, for example, 74314786 + ... + 74331651.

Almost surely, 2^{1253535403221} is an apocalyptic number.

It is an amenable number.

1253535403221 is a deficient number, since it is larger than the sum of its proper divisors (559059261751).

1253535403221 is a wasteful number, since it uses less digits than its factorization.

1253535403221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148647380 (or 148647377 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 1253535403221 in words is "one trillion, two hundred fifty-three billion, five hundred thirty-five million, four hundred three thousand, two hundred twenty-one".