53226021 has 4 divisors (see below), whose sum is σ = 70968032. Its totient is φ = 35484012.

The previous prime is 53225999. The next prime is 53226023. The reversal of 53226021 is 12062235.

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 not a de Polignac number, because 53226021 - 2⁹ = 53225509 is a prime.

It is a super-2 number, since 2×53226021² = 5666018622984882, which contains 22 as substring.

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 (53226023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8871001 + ... + 8871006.

It is an arithmetic number, because the mean of its divisors is an integer number (17742008).

Almost surely, 2^53226021 is an apocalyptic number.

It is an amenable number.

53226021 is a deficient number, since it is larger than the sum of its proper divisors (17742011).

53226021 is a wasteful number, since it uses less digits than its factorization.

53226021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17742010.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 53226021 is about 7295.6165606479. The cubic root of 53226021 is about 376.1617801061.

Adding to 53226021 its reverse (12062235), we get a palindrome (65288256).

The spelling of 53226021 in words is "fifty-three million, two hundred twenty-six thousand, twenty-one".