220210216621 has 4 divisors (see below), whose sum is σ = 220213532032. Its totient is φ = 220206901212.

The previous prime is 220210216573. The next prime is 220210216631. The reversal of 220210216621 is 126612012022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 126612012022 = 2 ⋅63306006011.

It is a cyclic number.

It is not a de Polignac number, because 220210216621 - 2⁷ = 220210216493 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 (220210216631) 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, 1555995 + ... + 1691608.

It is an arithmetic number, because the mean of its divisors is an integer number (55053383008).

Almost surely, 2^220210216621 is an apocalyptic number.

It is an amenable number.

220210216621 is a deficient number, since it is larger than the sum of its proper divisors (3315411).

220210216621 is an equidigital number, since it uses as much as digits as its factorization.

220210216621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315410.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 220210216621 its reverse (126612012022), we get a palindrome (346822228643).

The spelling of 220210216621 in words is "two hundred twenty billion, two hundred ten million, two hundred sixteen thousand, six hundred twenty-one".