21121221110 has 32 divisors (see below), whose sum is σ = 41502910464. Its totient is φ = 7675164000.

The previous prime is 21121221083. The next prime is 21121221113. The reversal of 21121221110 is 1112212112.

It is a super-2 number, since 2×21121221110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121221113) by changing a digit.

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, 96545 + ... + 227075.

It is an arithmetic number, because the mean of its divisors is an integer number (1296965952).

Almost surely, 2^21121221110 is an apocalyptic number.

21121221110 is a deficient number, since it is larger than the sum of its proper divisors (20381689354).

21121221110 is a wasteful number, since it uses less digits than its factorization.

21121221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132020.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121221110 its reverse (1112212112), we get a palindrome (22233433222).

The spelling of 21121221110 in words is "twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred ten".