21121201110 has 16 divisors (see below), whose sum is σ = 50690882736. Its totient is φ = 5632320288.

The previous prime is 21121201109. The next prime is 21121201151. The reversal of 21121201110 is 1110212112.

It is a super-2 number, since 2×21121201110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352019989 + ... + 352020048.

It is an arithmetic number, because the mean of its divisors is an integer number (3168180171).

Almost surely, 2^21121201110 is an apocalyptic number.

21121201110 is an abundant number, since it is smaller than the sum of its proper divisors (29569681626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121201110 is a wasteful number, since it uses less digits than its factorization.

21121201110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704040047.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21121201110 its reverse (1110212112), we get a palindrome (22231413222).

The spelling of 21121201110 in words is "twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred ten".