212220164641 has 4 divisors (see below), whose sum is σ = 212574456000. Its totient is φ = 211865873284.

The previous prime is 212220164633. The next prime is 212220164659. The reversal of 212220164641 is 146461022212.

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 212220164641 - 2³ = 212220164633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212220164671) 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, 177144781 + ... + 177145978.

It is an arithmetic number, because the mean of its divisors is an integer number (53143614000).

Almost surely, 2^212220164641 is an apocalyptic number.

It is an amenable number.

212220164641 is a deficient number, since it is larger than the sum of its proper divisors (354291359).

212220164641 is an equidigital number, since it uses as much as digits as its factorization.

212220164641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354291358.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 212220164641 its reverse (146461022212), we get a palindrome (358681186853).

The spelling of 212220164641 in words is "two hundred twelve billion, two hundred twenty million, one hundred sixty-four thousand, six hundred forty-one".