52142221 has 8 divisors (see below), whose sum is σ = 53349560. Its totient is φ = 50948352.

The previous prime is 52142197. The next prime is 52142239. The reversal of 52142221 is 12224125.

It can be written as a sum of positive squares in 4 ways, for example, as 9696996 + 42445225 = 3114^2 + 6515^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52142221 is a prime.

It is a super-2 number, since 2×52142221² = 5437622421625682, 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 (52142921) 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, 4681 + ... + 11233.

It is an arithmetic number, because the mean of its divisors is an integer number (6668695).

It is a Poulet number, since it divides 2^52142220-1.

Almost surely, 2^52142221 is an apocalyptic number.

It is an amenable number.

52142221 is a deficient number, since it is larger than the sum of its proper divisors (1207339).

52142221 is a wasteful number, since it uses less digits than its factorization.

52142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735.

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

The square root of 52142221 is about 7220.9570695303. The cubic root of 52142221 is about 373.5910889185.

Adding to 52142221 its reverse (12224125), we get a palindrome (64366346).

The spelling of 52142221 in words is "fifty-two million, one hundred forty-two thousand, two hundred twenty-one".