21121111202101 has 16 divisors (see below), whose sum is σ = 21951971864064. Its totient is φ = 20306170274544.

The previous prime is 21121111202099. The next prime is 21121111202161. The reversal of 21121111202101 is 10120211112112.

It is a cyclic number.

It is not a de Polignac number, because 21121111202101 - 2¹ = 21121111202099 is a prime.

It is a super-2 number, since 2×21121111202101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121111202161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 839280 + ... + 6553366.

It is an arithmetic number, because the mean of its divisors is an integer number (1371998241504).

Almost surely, 2^{21121111202101} is an apocalyptic number.

It is an amenable number.

21121111202101 is a deficient number, since it is larger than the sum of its proper divisors (830860661963).

21121111202101 is a wasteful number, since it uses less digits than its factorization.

21121111202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5715480.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21121111202101 its reverse (10120211112112), we get a palindrome (31241322314213).

The spelling of 21121111202101 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred two thousand, one hundred one".