211221200121 has 8 divisors (see below), whose sum is σ = 281631296544. Its totient is φ = 140812618560.

The previous prime is 211221200093. The next prime is 211221200123. The reversal of 211221200121 is 121002122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211221200121 - 2³¹ = 209073716473 is a prime.

It is a super-2 number, since 2×211221200121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221200121.

It is not an unprimeable number, because it can be changed into a prime (211221200123) 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, 1026 + ... + 649956.

It is an arithmetic number, because the mean of its divisors is an integer number (35203912068).

Almost surely, 2^211221200121 is an apocalyptic number.

It is an amenable number.

211221200121 is a deficient number, since it is larger than the sum of its proper divisors (70410096423).

211221200121 is a wasteful number, since it uses less digits than its factorization.

211221200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757431.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221200121 its reverse (121002122112), we get a palindrome (332223322233).

The spelling of 211221200121 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".