21121010210 has 32 divisors (see below), whose sum is σ = 39313257984. Its totient is φ = 8161488000.

The previous prime is 21121010167. The next prime is 21121010221. The reversal of 21121010210 is 1201012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121010191 and 21121010200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117350 + ... + 236670.

It is an arithmetic number, because the mean of its divisors is an integer number (1228539312).

Almost surely, 2^21121010210 is an apocalyptic number.

21121010210 is a deficient number, since it is larger than the sum of its proper divisors (18192247774).

21121010210 is a wasteful number, since it uses less digits than its factorization.

21121010210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119930.

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

Adding to 21121010210 its reverse (1201012112), we get a palindrome (22322022322).

The spelling of 21121010210 in words is "twenty-one billion, one hundred twenty-one million, ten thousand, two hundred ten".