6623212021 has 8 divisors (see below), whose sum is σ = 6663907800. Its totient is φ = 6582632448.

The previous prime is 6623212003. The next prime is 6623212051. The reversal of 6623212021 is 1202123266.

It can be written as a sum of positive squares in 4 ways, for example, as 1465817796 + 5157394225 = 38286^2 + 71815^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6623212021 - 2²⁹ = 6086341109 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 (6623212051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86695 + ... + 144091.

It is an arithmetic number, because the mean of its divisors is an integer number (832988475).

Almost surely, 2^6623212021 is an apocalyptic number.

It is an amenable number.

6623212021 is a deficient number, since it is larger than the sum of its proper divisors (40695779).

6623212021 is a wasteful number, since it uses less digits than its factorization.

6623212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58103.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 6623212021 is about 81383.1187716470. The cubic root of 6623212021 is about 1877.9739019072.

Adding to 6623212021 its reverse (1202123266), we get a palindrome (7825335287).

The spelling of 6623212021 in words is "six billion, six hundred twenty-three million, two hundred twelve thousand, twenty-one".