211402121 has 12 divisors (see below), whose sum is σ = 248179140. Its totient is φ = 179534880.

The previous prime is 211402111. The next prime is 211402159. The reversal of 211402121 is 121204112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 145467721 + 65934400 = 12061^2 + 8120^2 .

It is not a de Polignac number, because 211402121 - 2²² = 207207817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211402096 and 211402105.

It is not an unprimeable number, because it can be changed into a prime (211402111) 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, 14450 + ... + 25131.

It is an arithmetic number, because the mean of its divisors is an integer number (20681595).

Almost surely, 2^211402121 is an apocalyptic number.

It is an amenable number.

211402121 is a deficient number, since it is larger than the sum of its proper divisors (36777019).

211402121 is a wasteful number, since it uses less digits than its factorization.

211402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39704 (or 39697 counting only the distinct ones).

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

The square root of 211402121 is about 14539.6740334851. The cubic root of 211402121 is about 595.7121346435.

Adding to 211402121 its reverse (121204112), we get a palindrome (332606233).

The spelling of 211402121 in words is "two hundred eleven million, four hundred two thousand, one hundred twenty-one".