210202010000021 has 16 divisors (see below), whose sum is σ = 226635399345264. Its totient is φ = 193806429594624.

The previous prime is 210202009999841. The next prime is 210202010000051. The reversal of 210202010000021 is 120000010202012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 89255464095121 + 120946545904900 = 9447511^2 + 10997570^2 .

It is a cyclic number.

It is not a de Polignac number, because 210202010000021 - 2¹⁰ = 210202009998997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210202009999957 and 210202010000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210202010000051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51726371 + ... + 55641903.

It is an arithmetic number, because the mean of its divisors is an integer number (14164712459079).

Almost surely, 2^{210202010000021} is an apocalyptic number.

It is an amenable number.

210202010000021 is a deficient number, since it is larger than the sum of its proper divisors (16433389345243).

210202010000021 is a wasteful number, since it uses less digits than its factorization.

210202010000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920360.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 210202010000021 its reverse (120000010202012), we get a palindrome (330202020202033).

The spelling of 210202010000021 in words is "two hundred ten trillion, two hundred two billion, ten million, twenty-one", and thus it is an aban number.