21000011210 has 8 divisors (see below), whose sum is σ = 37800020196. Its totient is φ = 8400004480.

The previous prime is 21000011173. The next prime is 21000011257. The reversal of 21000011210 is 1211000012.

It can be written as a sum of positive squares in 2 ways, for example, as 20280323281 + 719687929 = 142409^2 + 26827^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050000551 + ... + 1050000570.

Almost surely, 2^21000011210 is an apocalyptic number.

21000011210 is a deficient number, since it is larger than the sum of its proper divisors (16800008986).

21000011210 is a wasteful number, since it uses less digits than its factorization.

21000011210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100001128.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21000011210 its reverse (1211000012), we get a palindrome (22211011222).

The spelling of 21000011210 in words is "twenty-one billion, eleven thousand, two hundred ten".