211002100212121 has 4 divisors (see below), whose sum is σ = 211392122579044. Its totient is φ = 210612077845200.

The previous prime is 211002100212103. The next prime is 211002100212139. The reversal of 211002100212121 is 121212001200112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (211002100212103) and next prime (211002100212139).

It can be written as a sum of positive squares in 2 ways, for example, as 164677265336896 + 46324834875225 = 12832664^2 + 6806235^2 .

It is a cyclic number.

It is not a de Polignac number, because 211002100212121 - 2¹³ = 211002100203929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211002100212095 and 211002100212104.

It is not an unprimeable number, because it can be changed into a prime (211002100218121) 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, 195011182650 + ... + 195011183731.

It is an arithmetic number, because the mean of its divisors is an integer number (52848030644761).

Almost surely, 2^{211002100212121} is an apocalyptic number.

It is an amenable number.

211002100212121 is a deficient number, since it is larger than the sum of its proper divisors (390022366923).

211002100212121 is an equidigital number, since it uses as much as digits as its factorization.

211002100212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390022366922.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211002100212121 its reverse (121212001200112), we get a palindrome (332214101412233).

The spelling of 211002100212121 in words is "two hundred eleven trillion, two billion, one hundred million, two hundred twelve thousand, one hundred twenty-one".