211020100121 has 4 divisors (see below), whose sum is σ = 222126421200. Its totient is φ = 199913779044.

The previous prime is 211020100097. The next prime is 211020100141. The reversal of 211020100121 is 121001020112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211020100121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211020100141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5553160511 + ... + 5553160548.

It is an arithmetic number, because the mean of its divisors is an integer number (55531605300).

Almost surely, 2^211020100121 is an apocalyptic number.

It is an amenable number.

211020100121 is a deficient number, since it is larger than the sum of its proper divisors (11106321079).

211020100121 is a wasteful number, since it uses less digits than its factorization.

211020100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11106321078.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211020100121 its reverse (121001020112), we get a palindrome (332021120233).

The spelling of 211020100121 in words is "two hundred eleven billion, twenty million, one hundred thousand, one hundred twenty-one".