52212421 has 4 divisors (see below), whose sum is σ = 52367692. Its totient is φ = 52057152.

The previous prime is 52212379. The next prime is 52212427. The reversal of 52212421 is 12421225.

52212421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37088100 + 15124321 = 6090^2 + 3889^2 .

It is a cyclic number.

It is not a de Polignac number, because 52212421 - 2¹⁷ = 52081349 is a prime.

It is a super-2 number, since 2×52212421² = 5452273813362482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52212427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77130 + ... + 77803.

It is an arithmetic number, because the mean of its divisors is an integer number (13091923).

Almost surely, 2^52212421 is an apocalyptic number.

It is an amenable number.

52212421 is a deficient number, since it is larger than the sum of its proper divisors (155271).

52212421 is a wasteful number, since it uses less digits than its factorization.

52212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155270.

The product of its digits is 320, while the sum is 19.

The square root of 52212421 is about 7225.8162860676. The cubic root of 52212421 is about 373.7586711783.

Adding to 52212421 its reverse (12421225), we get a palindrome (64633646).

The spelling of 52212421 in words is "fifty-two million, two hundred twelve thousand, four hundred twenty-one".