210020121011 has 4 divisors (see below), whose sum is σ = 214488634272. Its totient is φ = 205551607752.

The previous prime is 210020120951. The next prime is 210020121013. The reversal of 210020121011 is 110121020012.

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 210020121011 - 2¹⁴ = 210020104627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210020120983 and 210020121001.

It is not an unprimeable number, because it can be changed into a prime (210020121013) 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, 2234256560 + ... + 2234256653.

It is an arithmetic number, because the mean of its divisors is an integer number (53622158568).

Almost surely, 2^210020121011 is an apocalyptic number.

210020121011 is a deficient number, since it is larger than the sum of its proper divisors (4468513261).

210020121011 is an equidigital number, since it uses as much as digits as its factorization.

210020121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468513260.

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

Adding to 210020121011 its reverse (110121020012), we get a palindrome (320141141023).

It can be divided in two parts, 2100201 and 21011, that added together give a palindrome (2121212).

The spelling of 210020121011 in words is "two hundred ten billion, twenty million, one hundred twenty-one thousand, eleven".