4128521345 has 32 divisors (see below), whose sum is σ = 5548677120. Its totient is φ = 2927957760.

The previous prime is 4128521339. The next prime is 4128521357. The reversal of 4128521345 is 5431258214.

It is not a de Polignac number, because 4128521345 - 2¹⁶ = 4128455809 is a prime.

It is a super-2 number, since 2×4128521345² = 34089376992241218050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354302 + ... + 365768.

It is an arithmetic number, because the mean of its divisors is an integer number (173396160).

Almost surely, 2^4128521345 is an apocalyptic number.

It is an amenable number.

4128521345 is a deficient number, since it is larger than the sum of its proper divisors (1420155775).

4128521345 is a wasteful number, since it uses less digits than its factorization.

4128521345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11705.

The product of its digits is 38400, while the sum is 35.

The square root of 4128521345 is about 64253.5706789903. The cubic root of 4128521345 is about 1604.2233921704.

Adding to 4128521345 its reverse (5431258214), we get a palindrome (9559779559).

The spelling of 4128521345 in words is "four billion, one hundred twenty-eight million, five hundred twenty-one thousand, three hundred forty-five".