210121012011 has 16 divisors (see below), whose sum is σ = 280937378048. Its totient is φ = 139692924000.

The previous prime is 210121012007. The next prime is 210121012037. The reversal of 210121012011 is 110210121012.

It is not a de Polignac number, because 210121012011 - 2² = 210121012007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210121012001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3311736 + ... + 3374586.

It is an arithmetic number, because the mean of its divisors is an integer number (17558586128).

Almost surely, 2^210121012011 is an apocalyptic number.

210121012011 is a deficient number, since it is larger than the sum of its proper divisors (70816366037).

210121012011 is a wasteful number, since it uses less digits than its factorization.

210121012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65922.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 210121012011 its reverse (110210121012), we get a palindrome (320331133023).

The spelling of 210121012011 in words is "two hundred ten billion, one hundred twenty-one million, twelve thousand, eleven".