4245521121 has 10 divisors (see below), whose sum is σ = 6342074882. Its totient is φ = 2830347360.

The previous prime is 4245521117. The next prime is 4245521141. The reversal of 4245521121 is 1211255424.

It is a happy number.

4245521121 is a `hidden beast` number, since 424 + 5 + 5 + 211 + 21 = 666.

4245521121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3153945600 + 1091575521 = 56160^2 + 33039^2 .

It is not a de Polignac number, because 4245521121 - 2² = 4245521117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4245521141) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 26206840 + ... + 26207001.

Almost surely, 2^4245521121 is an apocalyptic number.

It is an amenable number.

4245521121 is a deficient number, since it is larger than the sum of its proper divisors (2096553761).

4245521121 is an equidigital number, since it uses as much as digits as its factorization.

4245521121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52413853 (or 52413844 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 4245521121 is about 65157.6635630837. The cubic root of 4245521121 is about 1619.2366877238.

Adding to 4245521121 its reverse (1211255424), we get a palindrome (5456776545).

The spelling of 4245521121 in words is "four billion, two hundred forty-five million, five hundred twenty-one thousand, one hundred twenty-one".