53642427021 has 12 divisors (see below), whose sum is σ = 77485735548. Its totient is φ = 35760588864.

The previous prime is 53642427017. The next prime is 53642427023. The reversal of 53642427021 is 12072424635.

53642427021 is a `hidden beast` number, since 5 + 3 + 642 + 4 + 2 + 7 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 36019864521 + 17622562500 = 189789^2 + 132750^2 .

It is not a de Polignac number, because 53642427021 - 2² = 53642427017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53642427023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 374161 + ... + 497273.

It is an arithmetic number, because the mean of its divisors is an integer number (6457144629).

Almost surely, 2^53642427021 is an apocalyptic number.

It is an amenable number.

53642427021 is a deficient number, since it is larger than the sum of its proper divisors (23843308527).

53642427021 is a wasteful number, since it uses less digits than its factorization.

53642427021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171532 (or 171529 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The spelling of 53642427021 in words is "fifty-three billion, six hundred forty-two million, four hundred twenty-seven thousand, twenty-one".