21112211202121 has 8 divisors (see below), whose sum is σ = 23010157900800. Its totient is φ = 19253397425232.

The previous prime is 21112211202101. The next prime is 21112211202151. The reversal of 21112211202121 is 12120211221112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112211202121 - 2⁷ = 21112211201993 is a prime.

It is a super-3 number, since 3×21112211202121³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112211202101) 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, 9783229321 + ... + 9783231478.

It is an arithmetic number, because the mean of its divisors is an integer number (2876269737600).

Almost surely, 2^{21112211202121} is an apocalyptic number.

It is an amenable number.

21112211202121 is a deficient number, since it is larger than the sum of its proper divisors (1897946698679).

21112211202121 is a wasteful number, since it uses less digits than its factorization.

21112211202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19566460895.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21112211202121 its reverse (12120211221112), we get a palindrome (33232422423233).

The spelling of 21112211202121 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, two hundred two thousand, one hundred twenty-one".