4661221621 has 8 divisors (see below), whose sum is σ = 5328178560. Its totient is φ = 3994531728.

The previous prime is 4661221603. The next prime is 4661221657. The reversal of 4661221621 is 1261221664.

It is a happy number.

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 4661221621 - 2⁵ = 4661221589 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 (4661221681) 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, 27841 + ... + 100486.

It is an arithmetic number, because the mean of its divisors is an integer number (666022320).

Almost surely, 2^4661221621 is an apocalyptic number.

It is an amenable number.

4661221621 is a deficient number, since it is larger than the sum of its proper divisors (666956939).

4661221621 is a wasteful number, since it uses less digits than its factorization.

4661221621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133523.

The product of its digits is 6912, while the sum is 31.

The square root of 4661221621 is about 68273.1398208695. The cubic root of 4661221621 is about 1670.4491149881.

The spelling of 4661221621 in words is "four billion, six hundred sixty-one million, two hundred twenty-one thousand, six hundred twenty-one".