4661647217021 has 4 divisors (see below), whose sum is σ = 4661655817632. Its totient is φ = 4661638616412.

The previous prime is 4661647216991. The next prime is 4661647217039. The reversal of 4661647217021 is 1207127461664.

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 4661647217021 - 2⁶ = 4661647216957 is a prime.

It is a super-2 number, since 2×4661647217021² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4661647217081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3428351 + ... + 4590956.

It is an arithmetic number, because the mean of its divisors is an integer number (1165413954408).

Almost surely, 2^{4661647217021} is an apocalyptic number.

It is an amenable number.

4661647217021 is a deficient number, since it is larger than the sum of its proper divisors (8600611).

4661647217021 is an equidigital number, since it uses as much as digits as its factorization.

4661647217021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8600610.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 4661647217021 in words is "four trillion, six hundred sixty-one billion, six hundred forty-seven million, two hundred seventeen thousand, twenty-one".