210120021011 has 4 divisors (see below), whose sum is σ = 210782860512. Its totient is φ = 209457181512.

The previous prime is 210120020963. The next prime is 210120021017. The reversal of 210120021011 is 110120021012.

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 210120021011 - 2¹⁸ = 210119758867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210120020983 and 210120021001.

It is not an unprimeable number, because it can be changed into a prime (210120021017) 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, 331419275 + ... + 331419908.

It is an arithmetic number, because the mean of its divisors is an integer number (52695715128).

Almost surely, 2^210120021011 is an apocalyptic number.

210120021011 is a deficient number, since it is larger than the sum of its proper divisors (662839501).

210120021011 is an equidigital number, since it uses as much as digits as its factorization.

210120021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662839500.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210120021011 its reverse (110120021012), we get a palindrome (320240042023).

Subtracting from 210120021011 its reverse (110120021012), we obtain a palindrome (99999999999).

The spelling of 210120021011 in words is "two hundred ten billion, one hundred twenty million, twenty-one thousand, eleven".