210121210012011 has 16 divisors (see below), whose sum is σ = 284113991052288. Its totient is φ = 138104707260800.

The previous prime is 210121210012001. The next prime is 210121210012031. The reversal of 210121210012011 is 110210012121012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210121210012011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (210121210012001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1741470 + ... + 20573651.

It is an arithmetic number, because the mean of its divisors is an integer number (17757124440768).

Almost surely, 2^{210121210012011} is an apocalyptic number.

210121210012011 is a deficient number, since it is larger than the sum of its proper divisors (73992781040277).

210121210012011 is a wasteful number, since it uses less digits than its factorization.

210121210012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22359402.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 210121210012011 its reverse (110210012121012), we get a palindrome (320331222133023).

The spelling of 210121210012011 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred ten million, twelve thousand, eleven".