53312021 has 4 divisors (see below), whose sum is σ = 60928032. Its totient is φ = 45696012.

The previous prime is 53312003. The next prime is 53312027. The reversal of 53312021 is 12021335.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53312021 - 2⁶ = 53311957 is a prime.

It is a super-4 number, since 4×53312021⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53312027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3807995 + ... + 3808008.

It is an arithmetic number, because the mean of its divisors is an integer number (15232008).

Almost surely, 2^53312021 is an apocalyptic number.

It is an amenable number.

53312021 is a deficient number, since it is larger than the sum of its proper divisors (7616011).

53312021 is an equidigital number, since it uses as much as digits as its factorization.

53312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7616010.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 53312021 is about 7301.5081318862. The cubic root of 53312021 is about 376.3642656885.

Adding to 53312021 its reverse (12021335), we get a palindrome (65333356).

The spelling of 53312021 in words is "fifty-three million, three hundred twelve thousand, twenty-one".