21212000121120 has 96 divisors (see below), whose sum is σ = 66851262491328. Its totient is φ = 5653700594688.

The previous prime is 21212000121097. The next prime is 21212000121173. The reversal of 21212000121120 is 2112100021212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21212000121120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10105954 + ... + 12023073.

It is an arithmetic number, because the mean of its divisors is an integer number (696367317618).

Almost surely, 2^{21212000121120} is an apocalyptic number.

21212000121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212000121120 is an abundant number, since it is smaller than the sum of its proper divisors (45639262370208).

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

21212000121120 is a wasteful number, since it uses less digits than its factorization.

21212000121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22131042 (or 22131034 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212000121120 its reverse (2112100021212), we get a palindrome (23324100142332).

The spelling of 21212000121120 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-one thousand, one hundred twenty".