210120021020111 has 4 divisors (see below), whose sum is σ = 210129665326152. Its totient is φ = 210110376714072.

The previous prime is 210120021020093. The next prime is 210120021020131. The reversal of 210120021020111 is 111020120021012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210120021020111 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 (210120021020131) 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, 4822120340 + ... + 4822163913.

It is an arithmetic number, because the mean of its divisors is an integer number (52532416331538).

Almost surely, 2^{210120021020111} is an apocalyptic number.

210120021020111 is a deficient number, since it is larger than the sum of its proper divisors (9644306041).

210120021020111 is an equidigital number, since it uses as much as digits as its factorization.

210120021020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9644306040.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210120021020111 its reverse (111020120021012), we get a palindrome (321140141041123).

Subtracting from 210120021020111 its reverse (111020120021012), we obtain a palindrome (99099900999099).

The spelling of 210120021020111 in words is "two hundred ten trillion, one hundred twenty billion, twenty-one million, twenty thousand, one hundred eleven".