21120011210 has 8 divisors (see below), whose sum is σ = 38016020196. Its totient is φ = 8448004480.

The previous prime is 21120011201. The next prime is 21120011243. The reversal of 21120011210 is 1211002112.

It can be written as a sum of positive squares in 2 ways, for example, as 17423736001 + 3696275209 = 131999^2 + 60797^2 .

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 = 21120011191 and 21120011200.

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, 1056000551 + ... + 1056000570.

Almost surely, 2^21120011210 is an apocalyptic number.

21120011210 is a deficient number, since it is larger than the sum of its proper divisors (16896008986).

21120011210 is a wasteful number, since it uses less digits than its factorization.

21120011210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112001128.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21120011210 its reverse (1211002112), we get a palindrome (22331013322).

The spelling of 21120011210 in words is "twenty-one billion, one hundred twenty million, eleven thousand, two hundred ten".