211123323101021 has 4 divisors (see below), whose sum is σ = 212029431784092. Its totient is φ = 210217214417952.

The previous prime is 211123323100979. The next prime is 211123323101023. The reversal of 211123323101021 is 120101323321112.

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 30728607268921 + 180394715832100 = 5543339^2 + 13431110^2 .

It is a cyclic number.

It is not a de Polignac number, because 211123323101021 - 2⁶ = 211123323100957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211123323101023) 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, 453054341186 + ... + 453054341651.

It is an arithmetic number, because the mean of its divisors is an integer number (53007357946023).

Almost surely, 2^{211123323101021} is an apocalyptic number.

It is an amenable number.

211123323101021 is a deficient number, since it is larger than the sum of its proper divisors (906108683071).

211123323101021 is an equidigital number, since it uses as much as digits as its factorization.

211123323101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906108683070.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 211123323101021 its reverse (120101323321112), we get a palindrome (331224646422133).

The spelling of 211123323101021 in words is "two hundred eleven trillion, one hundred twenty-three billion, three hundred twenty-three million, one hundred one thousand, twenty-one".