6221721453 has 8 divisors (see below), whose sum is σ = 8409267648. Its totient is φ = 4090994784.

The previous prime is 6221721449. The next prime is 6221721469. The reversal of 6221721453 is 3541271226.

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

It is not a de Polignac number, because 6221721453 - 2² = 6221721449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6221721433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14204625 + ... + 14205062.

It is an arithmetic number, because the mean of its divisors is an integer number (1051158456).

Almost surely, 2^6221721453 is an apocalyptic number.

It is an amenable number.

6221721453 is a deficient number, since it is larger than the sum of its proper divisors (2187546195).

6221721453 is a wasteful number, since it uses less digits than its factorization.

6221721453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28409763.

The product of its digits is 20160, while the sum is 33.

The square root of 6221721453 is about 78877.8895065024. The cubic root of 6221721453 is about 1839.2334406334.

Adding to 6221721453 its reverse (3541271226), we get a palindrome (9762992679).

The spelling of 6221721453 in words is "six billion, two hundred twenty-one million, seven hundred twenty-one thousand, four hundred fifty-three".