6451212021 has 8 divisors (see below), whose sum is σ = 8610144960. Its totient is φ = 4296543552.

The previous prime is 6451211981. The next prime is 6451212067. The reversal of 6451212021 is 1202121546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6451212021 - 2²⁶ = 6384103157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6451211982 and 6451212000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6451212821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1062585 + ... + 1068638.

It is an arithmetic number, because the mean of its divisors is an integer number (1076268120).

Almost surely, 2^6451212021 is an apocalyptic number.

It is an amenable number.

6451212021 is a deficient number, since it is larger than the sum of its proper divisors (2158932939).

6451212021 is a wasteful number, since it uses less digits than its factorization.

6451212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132235.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 6451212021 is about 80319.4373797526. The cubic root of 6451212021 is about 1861.5745734291.

Adding to 6451212021 its reverse (1202121546), we get a palindrome (7653333567).

The spelling of 6451212021 in words is "six billion, four hundred fifty-one million, two hundred twelve thousand, twenty-one".