4245122021 has 16 divisors (see below), whose sum is σ = 4930283520. Its totient is φ = 3579856560.

The previous prime is 4245122017. The next prime is 4245122023. The reversal of 4245122021 is 1202215424.

It is not a de Polignac number, because 4245122021 - 2² = 4245122017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4245122023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233270 + ... + 250808.

It is an arithmetic number, because the mean of its divisors is an integer number (308142720).

Almost surely, 2^4245122021 is an apocalyptic number.

It is an amenable number.

4245122021 is a deficient number, since it is larger than the sum of its proper divisors (685161499).

4245122021 is a wasteful number, since it uses less digits than its factorization.

4245122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18104.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 4245122021 is about 65154.6009196588. The cubic root of 4245122021 is about 1619.1859473793.

Adding to 4245122021 its reverse (1202215424), we get a palindrome (5447337445).

The spelling of 4245122021 in words is "four billion, two hundred forty-five million, one hundred twenty-two thousand, twenty-one".