210221220212011 has 4 divisors (see below), whose sum is σ = 211510920949672. Its totient is φ = 208931519474352.

The previous prime is 210221220211991. The next prime is 210221220212111. The reversal of 210221220212011 is 110212022122012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 210221220212011 - 2⁵ = 210221220211979 is a prime.

It is a super-2 number, since 2×210221220212011² (a number of 29 digits) contains 22 as substring.

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 210221220212011.

It is not an unprimeable number, because it can be changed into a prime (210221220212111) 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, 644850368586 + ... + 644850368911.

It is an arithmetic number, because the mean of its divisors is an integer number (52877730237418).

Almost surely, 2^{210221220212011} is an apocalyptic number.

210221220212011 is a deficient number, since it is larger than the sum of its proper divisors (1289700737661).

210221220212011 is a wasteful number, since it uses less digits than its factorization.

210221220212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289700737660.

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

Adding to 210221220212011 its reverse (110212022122012), we get a palindrome (320433242334023).

The spelling of 210221220212011 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, eleven".