212221564655 has 8 divisors (see below), whose sum is σ = 255085429632. Its totient is φ = 169497550368.

The previous prime is 212221564649. The next prime is 212221564661. The reversal of 212221564655 is 556465122212.

It is an interprime number because it is at equal distance from previous prime (212221564649) and next prime (212221564661).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212221564655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34959332 + ... + 34965401.

It is an arithmetic number, because the mean of its divisors is an integer number (31885678704).

Almost surely, 2^212221564655 is an apocalyptic number.

212221564655 is a deficient number, since it is larger than the sum of its proper divisors (42863864977).

212221564655 is an equidigital number, since it uses as much as digits as its factorization.

212221564655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69925345.

The product of its digits is 288000, while the sum is 41.

Adding to 212221564655 its reverse (556465122212), we get a palindrome (768686686867).

The spelling of 212221564655 in words is "two hundred twelve billion, two hundred twenty-one million, five hundred sixty-four thousand, six hundred fifty-five".