211020121 has 8 divisors (see below), whose sum is σ = 227749760. Its totient is φ = 194361552.

The previous prime is 211020119. The next prime is 211020127. The reversal of 211020121 is 121020112.

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

It is a cyclic number.

It is not a de Polignac number, because 211020121 - 2¹ = 211020119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020098 and 211020107.

It is not an unprimeable number, because it can be changed into a prime (211020127) 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, 11511 + ... + 23548.

It is an arithmetic number, because the mean of its divisors is an integer number (28468720).

Almost surely, 2^211020121 is an apocalyptic number.

It is an amenable number.

211020121 is a deficient number, since it is larger than the sum of its proper divisors (16729639).

211020121 is a wasteful number, since it uses less digits than its factorization.

211020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35535.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 211020121 is about 14526.5316232059. The cubic root of 211020121 is about 595.3531044392.

Adding to 211020121 its reverse (121020112), we get a palindrome (332040233).

Subtracting from 211020121 its reverse (121020112), we obtain a palindrome (90000009).

The spelling of 211020121 in words is "two hundred eleven million, twenty thousand, one hundred twenty-one".