211220020121 has 12 divisors (see below), whose sum is σ = 234421526976. Its totient is φ = 190153934520.

The previous prime is 211220020093. The next prime is 211220020127. The reversal of 211220020121 is 121020022112.

It is not a de Polignac number, because 211220020121 - 2²² = 211215825817 is a prime.

It is a super-2 number, since 2×211220020121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220020096 and 211220020105.

It is not an unprimeable number, because it can be changed into a prime (211220020127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8461421 + ... + 8486346.

It is an arithmetic number, because the mean of its divisors is an integer number (19535127248).

Almost surely, 2^211220020121 is an apocalyptic number.

It is an amenable number.

211220020121 is a deficient number, since it is larger than the sum of its proper divisors (23201506855).

211220020121 is a wasteful number, since it uses less digits than its factorization.

211220020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16947892 (or 16947881 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211220020121 its reverse (121020022112), we get a palindrome (332240042233).

The spelling of 211220020121 in words is "two hundred eleven billion, two hundred twenty million, twenty thousand, one hundred twenty-one".