7525021221 has 12 divisors (see below), whose sum is σ = 10871820960. Its totient is φ = 5015598120.

The previous prime is 7525021213. The next prime is 7525021237. The reversal of 7525021221 is 1221205257.

7525021221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7525021221 - 2³ = 7525021213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7525021291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45015 + ... + 130676.

It is an arithmetic number, because the mean of its divisors is an integer number (905985080).

Almost surely, 2^7525021221 is an apocalyptic number.

It is an amenable number.

7525021221 is a deficient number, since it is larger than the sum of its proper divisors (3346799739).

7525021221 is a wasteful number, since it uses less digits than its factorization.

7525021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180456 (or 180453 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 7525021221 is about 86746.8801802117. The cubic root of 7525021221 is about 1959.6081770036.

Adding to 7525021221 its reverse (1221205257), we get a palindrome (8746226478).

The spelling of 7525021221 in words is "seven billion, five hundred twenty-five million, twenty-one thousand, two hundred twenty-one".