21210111112210 has 16 divisors (see below), whose sum is σ = 38330304388992. Its totient is φ = 8450243470000.

The previous prime is 21210111112199. The next prime is 21210111112219. The reversal of 21210111112210 is 1221111101212.

It is a super-2 number, since 2×21210111112210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210111112219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4225119226 + ... + 4225124245.

It is an arithmetic number, because the mean of its divisors is an integer number (2395644024312).

Almost surely, 2^{21210111112210} is an apocalyptic number.

21210111112210 is a deficient number, since it is larger than the sum of its proper divisors (17120193276782).

21210111112210 is a wasteful number, since it uses less digits than its factorization.

21210111112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8450243729.

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

Adding to 21210111112210 its reverse (1221111101212), we get a palindrome (22431222213422).

The spelling of 21210111112210 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred twelve thousand, two hundred ten".