210210011021 has 4 divisors (see below), whose sum is σ = 210486240444. Its totient is φ = 209933781600.

The previous prime is 210210010993. The next prime is 210210011113. The reversal of 210210011021 is 120110012012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 803098921 + 209406912100 = 28339^2 + 457610^2 .

It is a cyclic number.

It is not a de Polignac number, because 210210011021 - 2⁶ = 210210010957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210210010993 and 210210011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210011521) 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, 138113570 + ... + 138115091.

It is an arithmetic number, because the mean of its divisors is an integer number (52621560111).

Almost surely, 2^210210011021 is an apocalyptic number.

It is an amenable number.

210210011021 is a deficient number, since it is larger than the sum of its proper divisors (276229423).

210210011021 is an equidigital number, since it uses as much as digits as its factorization.

210210011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276229422.

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

Adding to 210210011021 its reverse (120110012012), we get a palindrome (330320023033).

Subtracting from 210210011021 its reverse (120110012012), we obtain a palindrome (90099999009).

The spelling of 210210011021 in words is "two hundred ten billion, two hundred ten million, eleven thousand, twenty-one".