210000010021 has 8 divisors (see below), whose sum is σ = 212513252000. Its totient is φ = 207501089040.

The previous prime is 210000010013. The next prime is 210000010067. The reversal of 210000010021 is 120010000012.

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 210000010021 - 2³ = 210000010013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210000009986 and 210000010013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000010081) 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, 3550746 + ... + 3609403.

It is an arithmetic number, because the mean of its divisors is an integer number (26564156500).

Almost surely, 2^210000010021 is an apocalyptic number.

It is an amenable number.

210000010021 is a deficient number, since it is larger than the sum of its proper divisors (2513241979).

210000010021 is a wasteful number, since it uses less digits than its factorization.

210000010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7160499.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 210000010021 its reverse (120010000012), we get a palindrome (330010010033).

The spelling of 210000010021 in words is "two hundred ten billion, ten thousand, twenty-one".