4124525221 has 4 divisors (see below), whose sum is σ = 4145896012. Its totient is φ = 4103154432.

The previous prime is 4124525201. The next prime is 4124525233. The reversal of 4124525221 is 1225254214.

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: 1225254214 = 2 ⋅612627107.

It can be written as a sum of positive squares in 2 ways, for example, as 328116996 + 3796408225 = 18114^2 + 61615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4124525221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4124525221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4124525201) 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, 10685106 + ... + 10685491.

It is an arithmetic number, because the mean of its divisors is an integer number (1036474003).

Almost surely, 2^4124525221 is an apocalyptic number.

It is an amenable number.

4124525221 is a deficient number, since it is larger than the sum of its proper divisors (21370791).

4124525221 is a wasteful number, since it uses less digits than its factorization.

4124525221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21370790.

The product of its digits is 6400, while the sum is 28.

The square root of 4124525221 is about 64222.4666374626. The cubic root of 4124525221 is about 1603.7056325384.

Adding to 4124525221 its reverse (1225254214), we get a palindrome (5349779435).

It can be divided in two parts, 41245 and 25221, that added together give a palindrome (66466).

The spelling of 4124525221 in words is "four billion, one hundred twenty-four million, five hundred twenty-five thousand, two hundred twenty-one".