211021220121 has 8 divisors (see below), whose sum is σ = 281446413120. Its totient is φ = 140638420272.

The previous prime is 211021220117. The next prime is 211021220161. The reversal of 211021220121 is 121022120112.

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

It is not a de Polignac number, because 211021220121 - 2² = 211021220117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211021220121.

It is not an unprimeable number, because it can be changed into a prime (211021220101) 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, 10586670 + ... + 10606583.

It is an arithmetic number, because the mean of its divisors is an integer number (35180801640).

Almost surely, 2^211021220121 is an apocalyptic number.

It is an amenable number.

211021220121 is a deficient number, since it is larger than the sum of its proper divisors (70425192999).

211021220121 is a wasteful number, since it uses less digits than its factorization.

211021220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21196575.

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

Adding to 211021220121 its reverse (121022120112), we get a palindrome (332043340233).

The spelling of 211021220121 in words is "two hundred eleven billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".