221012212012021 has 8 divisors (see below), whose sum is σ = 225265536545760. Its totient is φ = 216775799306352.

The previous prime is 221012212012003. The next prime is 221012212012069. The reversal of 221012212012021 is 120210212210122.

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 221012212012021 - 2⁵ = 221012212011989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221012212012021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012212012121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4227930630 + ... + 4227982903.

It is an arithmetic number, because the mean of its divisors is an integer number (28158192068220).

Almost surely, 2^{221012212012021} is an apocalyptic number.

It is an amenable number.

221012212012021 is a deficient number, since it is larger than the sum of its proper divisors (4253324533739).

221012212012021 is an equidigital number, since it uses as much as digits as its factorization.

221012212012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8455914035.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221012212012021 its reverse (120210212210122), we get a palindrome (341222424222143).

The spelling of 221012212012021 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, twelve thousand, twenty-one".