211221222221021 has 8 divisors (see below), whose sum is σ = 211818743194080. Its totient is φ = 210623868330192.

The previous prime is 211221222220963. The next prime is 211221222221071. The reversal of 211221222221021 is 120122222122112.

211221222221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211221222221021 - 2⁴⁶ = 140852478043357 is a prime.

It is a super-2 number, since 2×211221222221021² (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 (211221222221071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39238415 + ... + 44295548.

It is an arithmetic number, because the mean of its divisors is an integer number (26477342899260).

Almost surely, 2^{211221222221021} is an apocalyptic number.

It is an amenable number.

211221222221021 is a deficient number, since it is larger than the sum of its proper divisors (597520973059).

211221222221021 is an equidigital number, since it uses as much as digits as its factorization.

211221222221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83541115.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 211221222221021 its reverse (120122222122112), we get a palindrome (331343444343133).

The spelling of 211221222221021 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".