4651253021 has 4 divisors (see below), whose sum is σ = 4659097212. Its totient is φ = 4643408832.

The previous prime is 4651253011. The next prime is 4651253027. The reversal of 4651253021 is 1203521564.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3512932900 + 1138320121 = 59270^2 + 33739^2 .

It is a cyclic number.

It is not a de Polignac number, because 4651253021 - 2²⁶ = 4584144157 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 (4651253027) 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, 3921206 + ... + 3922391.

It is an arithmetic number, because the mean of its divisors is an integer number (1164774303).

Almost surely, 2^4651253021 is an apocalyptic number.

It is an amenable number.

4651253021 is a deficient number, since it is larger than the sum of its proper divisors (7844191).

4651253021 is an equidigital number, since it uses as much as digits as its factorization.

4651253021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7844190.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 4651253021 is about 68200.0954618100. The cubic root of 4651253021 is about 1669.2574442672.

Adding to 4651253021 its reverse (1203521564), we get a palindrome (5854774585).

The spelling of 4651253021 in words is "four billion, six hundred fifty-one million, two hundred fifty-three thousand, twenty-one".