211100012201021 has 4 divisors (see below), whose sum is σ = 211106834894844. Its totient is φ = 211093189507200.

The previous prime is 211100012201017. The next prime is 211100012201033. The reversal of 211100012201021 is 120102210001112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98926198207225 + 112173813993796 = 9946165^2 + 10591214^2 .

It is a cyclic number.

It is not a de Polignac number, because 211100012201021 - 2² = 211100012201017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211100012200987 and 211100012201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100012201521) 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, 3411300500 + ... + 3411362381.

It is an arithmetic number, because the mean of its divisors is an integer number (52776708723711).

Almost surely, 2^{211100012201021} is an apocalyptic number.

It is an amenable number.

211100012201021 is a deficient number, since it is larger than the sum of its proper divisors (6822693823).

211100012201021 is an equidigital number, since it uses as much as digits as its factorization.

211100012201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822693822.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211100012201021 its reverse (120102210001112), we get a palindrome (331202222202133).

The spelling of 211100012201021 in words is "two hundred eleven trillion, one hundred billion, twelve million, two hundred one thousand, twenty-one".