210021122011 has 4 divisors (see below), whose sum is σ = 210271446000. Its totient is φ = 209770798024.

The previous prime is 210021122009. The next prime is 210021122023. The reversal of 210021122011 is 110221120012.

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

It is a cyclic number.

It is not a de Polignac number, because 210021122011 - 2¹ = 210021122009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021121982 and 210021122000.

It is not an unprimeable number, because it can be changed into a prime (210021122041) 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, 125160736 + ... + 125162413.

It is an arithmetic number, because the mean of its divisors is an integer number (52567861500).

Almost surely, 2^210021122011 is an apocalyptic number.

210021122011 is a deficient number, since it is larger than the sum of its proper divisors (250323989).

210021122011 is an equidigital number, since it uses as much as digits as its factorization.

210021122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250323988.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210021122011 its reverse (110221120012), we get a palindrome (320242242023).

The spelling of 210021122011 in words is "two hundred ten billion, twenty-one million, one hundred twenty-two thousand, eleven".