211000121110021 has 4 divisors (see below), whose sum is σ = 211000178771200. Its totient is φ = 211000063448844.

The previous prime is 211000121109979. The next prime is 211000121110043. The reversal of 211000121110021 is 120011121000112.

It is a happy number.

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 not a de Polignac number, because 211000121110021 - 2¹³ = 211000121101829 is a prime.

It is a super-2 number, since 2×211000121110021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211000121109983 and 211000121110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211000121110091) 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, 22940511 + ... + 30793948.

It is an arithmetic number, because the mean of its divisors is an integer number (52750044692800).

Almost surely, 2^{211000121110021} is an apocalyptic number.

It is an amenable number.

211000121110021 is a deficient number, since it is larger than the sum of its proper divisors (57661179).

211000121110021 is an equidigital number, since it uses as much as digits as its factorization.

211000121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57661178.

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

Adding to 211000121110021 its reverse (120011121000112), we get a palindrome (331011242110133).

The spelling of 211000121110021 in words is "two hundred eleven trillion, one hundred twenty-one million, one hundred ten thousand, twenty-one".