21120212011104 has 72 divisors (see below), whose sum is σ = 60083158825872. Its totient is φ = 7037426753280.

The previous prime is 21120212011027. The next prime is 21120212011109. The reversal of 21120212011104 is 40111021202112.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120212011109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13002127 + ... + 14536014.

It is an arithmetic number, because the mean of its divisors is an integer number (834488317026).

Almost surely, 2^{21120212011104} is an apocalyptic number.

21120212011104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21120212011104 is an abundant number, since it is smaller than the sum of its proper divisors (38962946814768).

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

21120212011104 is a wasteful number, since it uses less digits than its factorization.

21120212011104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27540820 (or 27540809 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21120212011104 its reverse (40111021202112), we get a palindrome (61231233213216).

The spelling of 21120212011104 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, eleven thousand, one hundred four".