53000021 has 8 divisors (see below), whose sum is σ = 54865920. Its totient is φ = 51157008.

The previous prime is 53000011. The next prime is 53000039. The reversal of 53000021 is 12000035.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53000021 - 2¹⁰ = 52998997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52999966 and 53000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53000011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941 + ... + 10338.

It is an arithmetic number, because the mean of its divisors is an integer number (6858240).

Almost surely, 2^53000021 is an apocalyptic number.

It is an amenable number.

53000021 is a deficient number, since it is larger than the sum of its proper divisors (1865899).

53000021 is a wasteful number, since it uses less digits than its factorization.

53000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11443.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 53000021 is about 7280.1113315663. Note that the first 3 decimals coincide. The cubic root of 53000021 is about 375.6286250334.

Adding to 53000021 its reverse (12000035), we get a palindrome (65000056).

The spelling of 53000021 in words is "fifty-three million, twenty-one", and thus it is an aban number and an uban number.