21202112000121 has 128 divisors (see below), whose sum is σ = 33022432235520. Its totient is φ = 11991545330688.

The previous prime is 21202112000107. The next prime is 21202112000143. The reversal of 21202112000121 is 12100021120212.

It is not a de Polignac number, because 21202112000121 - 2¹⁹ = 21202111475833 is a prime.

It is a super-3 number, since 3×21202112000121³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21202112000121.

It is not an unprimeable number, because it can be changed into a prime (21202112000921) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6912979230 + ... + 6912982296.

It is an arithmetic number, because the mean of its divisors is an integer number (257987751840).

Almost surely, 2^{21202112000121} is an apocalyptic number.

It is an amenable number.

21202112000121 is a deficient number, since it is larger than the sum of its proper divisors (11820320235399).

21202112000121 is a wasteful number, since it uses less digits than its factorization.

21202112000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335.

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

Adding to 21202112000121 its reverse (12100021120212), we get a palindrome (33302133120333).

The spelling of 21202112000121 in words is "twenty-one trillion, two hundred two billion, one hundred twelve million, one hundred twenty-one", and thus it is an aban number.