6451211021 has 4 divisors (see below), whose sum is σ = 6532872000. Its totient is φ = 6369550044.

The previous prime is 6451210957. The next prime is 6451211029. The reversal of 6451211021 is 1201121546.

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 a cyclic number.

It is not a de Polignac number, because 6451211021 - 2⁶ = 6451210957 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 (6451211029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40830371 + ... + 40830528.

It is an arithmetic number, because the mean of its divisors is an integer number (1633218000).

Almost surely, 2^6451211021 is an apocalyptic number.

It is an amenable number.

6451211021 is a deficient number, since it is larger than the sum of its proper divisors (81660979).

6451211021 is an equidigital number, since it uses as much as digits as its factorization.

6451211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81660978.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 6451211021 is about 80319.4311546092. The cubic root of 6451211021 is about 1861.5744772417.

Adding to 6451211021 its reverse (1201121546), we get a palindrome (7652332567).

The spelling of 6451211021 in words is "six billion, four hundred fifty-one million, two hundred eleven thousand, twenty-one".