221021120210021 has 8 divisors (see below), whose sum is σ = 222172920657600. Its totient is φ = 219870303791040.

The previous prime is 221021120209969. The next prime is 221021120210047. The reversal of 221021120210021 is 120012021120122.

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 221021120210021 - 2⁶ = 221021120209957 is a prime.

It is a super-2 number, since 2×221021120210021² (a number of 29 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 (221021120210221) 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, 245556761 + ... + 246455198.

It is an arithmetic number, because the mean of its divisors is an integer number (27771615082200).

Almost surely, 2^{221021120210021} is an apocalyptic number.

It is an amenable number.

221021120210021 is a deficient number, since it is larger than the sum of its proper divisors (1151800447579).

221021120210021 is a wasteful number, since it uses less digits than its factorization.

221021120210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492014299.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221021120210021 its reverse (120012021120122), we get a palindrome (341033141330143).

The spelling of 221021120210021 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred ten thousand, twenty-one".