21121100210 has 32 divisors (see below), whose sum is σ = 43491330432. Its totient is φ = 7234485120.

The previous prime is 21121100173. The next prime is 21121100227. The reversal of 21121100210 is 1200112112.

It is a super-2 number, since 2×21121100210² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121100191 and 21121100200.

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 15 ways as a sum of consecutive naturals, for example, 73736 + ... + 218355.

It is an arithmetic number, because the mean of its divisors is an integer number (1359104076).

Almost surely, 2^21121100210 is an apocalyptic number.

21121100210 is an abundant number, since it is smaller than the sum of its proper divisors (22370230222).

21121100210 is a wasteful number, since it uses less digits than its factorization.

21121100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293138.

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

Adding to 21121100210 its reverse (1200112112), we get a palindrome (22321212322).

The spelling of 21121100210 in words is "twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred ten".