21000010210 has 8 divisors (see below), whose sum is σ = 37800018396. Its totient is φ = 8400004080.

The previous prime is 21000010177. The next prime is 21000010231. The reversal of 21000010210 is 1201000012.

It can be written as a sum of positive squares in 2 ways, for example, as 18167535369 + 2832474841 = 134787^2 + 53221^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21000010193 and 21000010202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050000501 + ... + 1050000520.

Almost surely, 2^21000010210 is an apocalyptic number.

21000010210 is a deficient number, since it is larger than the sum of its proper divisors (16800008186).

21000010210 is a wasteful number, since it uses less digits than its factorization.

21000010210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100001028.

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

Adding to 21000010210 its reverse (1201000012), we get a palindrome (22201010222).

The spelling of 21000010210 in words is "twenty-one billion, ten thousand, two hundred ten".