53323621 has 4 divisors (see below), whose sum is σ = 57425452. Its totient is φ = 49221792.

The previous prime is 53323609. The next prime is 53323631. The reversal of 53323621 is 12632335.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12632335 = 5 ⋅2526467.

It can be written as a sum of positive squares in 2 ways, for example, as 18395521 + 34928100 = 4289^2 + 5910^2 .

It is a cyclic number.

It is not a de Polignac number, because 53323621 - 2¹³ = 53315429 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 (53323631) 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, 2050896 + ... + 2050921.

It is an arithmetic number, because the mean of its divisors is an integer number (14356363).

Almost surely, 2^53323621 is an apocalyptic number.

It is an amenable number.

53323621 is a deficient number, since it is larger than the sum of its proper divisors (4101831).

53323621 is a wasteful number, since it uses less digits than its factorization.

53323621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101830.

The product of its digits is 3240, while the sum is 25.

The square root of 53323621 is about 7302.3024451196. The cubic root of 53323621 is about 376.3915610263.

Adding to 53323621 its reverse (12632335), we get a palindrome (65955956).

The spelling of 53323621 in words is "fifty-three million, three hundred twenty-three thousand, six hundred twenty-one".