4245403521 has 4 divisors (see below), whose sum is σ = 5660538032. Its totient is φ = 2830269012.

The previous prime is 4245403517. The next prime is 4245403537. The reversal of 4245403521 is 1253045424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4245403521 - 2² = 4245403517 is a prime.

It is a super-2 number, since 2×4245403521² = 36046902112238394882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4245403511) 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, 707567251 + ... + 707567256.

It is an arithmetic number, because the mean of its divisors is an integer number (1415134508).

Almost surely, 2^4245403521 is an apocalyptic number.

It is an amenable number.

4245403521 is a deficient number, since it is larger than the sum of its proper divisors (1415134511).

4245403521 is a wasteful number, since it uses less digits than its factorization.

4245403521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415134510.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 4245403521 is about 65156.7611303693. The cubic root of 4245403521 is about 1619.2217367525.

Adding to 4245403521 its reverse (1253045424), we get a palindrome (5498448945).

The spelling of 4245403521 in words is "four billion, two hundred forty-five million, four hundred three thousand, five hundred twenty-one".