211112101021 has 4 divisors (see below), whose sum is σ = 211162358044. Its totient is φ = 211061844000.

The previous prime is 211112101007. The next prime is 211112101033. The reversal of 211112101021 is 120101211112.

It is a happy number.

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 27336984921 + 183775116100 = 165339^2 + 428690^2 .

It is a cyclic number.

It is not a de Polignac number, because 211112101021 - 2²¹ = 211110003869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211112100992 and 211112101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112101001) 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, 25122210 + ... + 25130611.

It is an arithmetic number, because the mean of its divisors is an integer number (52790589511).

Almost surely, 2^211112101021 is an apocalyptic number.

It is an amenable number.

211112101021 is a deficient number, since it is larger than the sum of its proper divisors (50257023).

211112101021 is an equidigital number, since it uses as much as digits as its factorization.

211112101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50257022.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211112101021 its reverse (120101211112), we get a palindrome (331213312133).

The spelling of 211112101021 in words is "two hundred eleven billion, one hundred twelve million, one hundred one thousand, twenty-one".