210200010000021 has 12 divisors (see below), whose sum is σ = 303622448002380. Its totient is φ = 140133242460480.

The previous prime is 210200009999957. The next prime is 210200010000023. The reversal of 210200010000021 is 120000010002012.

210200010000021 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 106023060562500 + 104176949437521 = 10296750^2 + 10206711^2 .

It is not a de Polignac number, because 210200010000021 - 2⁶ = 210200009999957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210200009999958 and 210200010000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210200010000023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7002631 + ... + 21666491.

It is an arithmetic number, because the mean of its divisors is an integer number (25301870666865).

Almost surely, 2^{210200010000021} is an apocalyptic number.

It is an amenable number.

210200010000021 is a deficient number, since it is larger than the sum of its proper divisors (93422438002359).

210200010000021 is a wasteful number, since it uses less digits than its factorization.

210200010000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16256596 (or 16256593 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210200010000021 its reverse (120000010002012), we get a palindrome (330200020002033).

The spelling of 210200010000021 in words is "two hundred ten trillion, two hundred billion, ten million, twenty-one", and thus it is an aban number.