21212200111004 has 48 divisors (see below), whose sum is σ = 42524466566400. Its totient is φ = 9069504278016.

The previous prime is 21212200110967. The next prime is 21212200111007. The reversal of 21212200111004 is 40011100221212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212200111007) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 130520507 + ... + 130682925.

It is an arithmetic number, because the mean of its divisors is an integer number (885926386800).

Almost surely, 2^{21212200111004} is an apocalyptic number.

It is an amenable number.

21212200111004 is an abundant number, since it is smaller than the sum of its proper divisors (21312266455396).

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

21212200111004 is a wasteful number, since it uses less digits than its factorization.

21212200111004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173402 (or 173400 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212200111004 its reverse (40011100221212), we get a palindrome (61223300332216).

The spelling of 21212200111004 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, one hundred eleven thousand, four".