211221202220121 has 32 divisors (see below), whose sum is σ = 296986012286976. Its totient is φ = 133333003944000.

The previous prime is 211221202220099. The next prime is 211221202220123. The reversal of 211221202220121 is 121022202122112.

It is a de Polignac number, because none of the positive numbers 2^k-211221202220121 is a prime.

It is a super-2 number, since 2×211221202220121² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221202220123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7696831 + ... + 21947291.

It is an arithmetic number, because the mean of its divisors is an integer number (9280812883968).

Almost surely, 2^{211221202220121} is an apocalyptic number.

It is an amenable number.

211221202220121 is a deficient number, since it is larger than the sum of its proper divisors (85764810066855).

211221202220121 is a wasteful number, since it uses less digits than its factorization.

211221202220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14253933.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211221202220121 its reverse (121022202122112), we get a palindrome (332243404342233).

The spelling of 211221202220121 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred two million, two hundred twenty thousand, one hundred twenty-one".