210011111020021 has 8 divisors (see below), whose sum is σ = 214947010095840. Its totient is φ = 205077571932912.

The previous prime is 210011111020001. The next prime is 210011111020031. The reversal of 210011111020021 is 120020111110012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210011111020021 - 2⁹ = 210011111019509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210011111019983 and 210011111020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210011111020001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589817110 + ... + 590173063.

It is an arithmetic number, because the mean of its divisors is an integer number (26868376261980).

Almost surely, 2^{210011111020021} is an apocalyptic number.

It is an amenable number.

210011111020021 is a deficient number, since it is larger than the sum of its proper divisors (4935899075819).

210011111020021 is a wasteful number, since it uses less digits than its factorization.

210011111020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179994355.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210011111020021 its reverse (120020111110012), we get a palindrome (330031222130033).

The spelling of 210011111020021 in words is "two hundred ten trillion, eleven billion, one hundred eleven million, twenty thousand, twenty-one".