211020012121 has 16 divisors (see below), whose sum is σ = 215653572288. Its totient is φ = 206427355200.

The previous prime is 211020012107. The next prime is 211020012157. The reversal of 211020012121 is 121210020112.

It is a cyclic number.

It is not a de Polignac number, because 211020012121 - 2¹⁷ = 211019881049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211020010121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8620926 + ... + 8645368.

It is an arithmetic number, because the mean of its divisors is an integer number (13478348268).

Almost surely, 2^211020012121 is an apocalyptic number.

It is an amenable number.

211020012121 is a deficient number, since it is larger than the sum of its proper divisors (4633560167).

211020012121 is a wasteful number, since it uses less digits than its factorization.

211020012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25272.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211020012121 its reverse (121210020112), we get a palindrome (332230032233).

The spelling of 211020012121 in words is "two hundred eleven billion, twenty million, twelve thousand, one hundred twenty-one".