21111201101121 has 16 divisors (see below), whose sum is σ = 28913168379648. Its totient is φ = 13691792793600.

The previous prime is 21111201101119. The next prime is 21111201101167. The reversal of 21111201101121 is 12110110211112.

It is not a de Polignac number, because 21111201101121 - 2¹ = 21111201101119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111201101121.

It is not an unprimeable number, because it can be changed into a prime (21111201101101) 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, 12826560 + ... + 14378561.

It is an arithmetic number, because the mean of its divisors is an integer number (1807073023728).

Almost surely, 2^{21111201101121} is an apocalyptic number.

It is an amenable number.

21111201101121 is a deficient number, since it is larger than the sum of its proper divisors (7801967278527).

21111201101121 is a wasteful number, since it uses less digits than its factorization.

21111201101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27212152.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111201101121 its reverse (12110110211112), we get a palindrome (33221311312233).

The spelling of 21111201101121 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, one hundred one thousand, one hundred twenty-one".