53545531221 has 40 divisors (see below), whose sum is σ = 98446498304. Its totient is φ = 28243792800.

The previous prime is 53545531201. The next prime is 53545531229. The reversal of 53545531221 is 12213554535.

53545531221 is a `hidden beast` number, since 5 + 354 + 55 + 31 + 221 = 666.

It is not a de Polignac number, because 53545531221 - 2⁵ = 53545531189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53545531229) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3624805 + ... + 3639546.

Almost surely, 2^53545531221 is an apocalyptic number.

It is an amenable number.

53545531221 is a deficient number, since it is larger than the sum of its proper divisors (44900967083).

53545531221 is a wasteful number, since it uses less digits than its factorization.

53545531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264383 (or 7264374 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The spelling of 53545531221 in words is "fifty-three billion, five hundred forty-five million, five hundred thirty-one thousand, two hundred twenty-one".