21211000001121 has 16 divisors (see below), whose sum is σ = 32324652132224. Its totient is φ = 12119398308864.

The previous prime is 21211000001117. The next prime is 21211000001129. The reversal of 21211000001121 is 12110000011212.

It is not a de Polignac number, because 21211000001121 - 2² = 21211000001117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21211000001097 and 21211000001106.

It is not an unprimeable number, because it can be changed into a prime (21211000001129) 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, 48657856 + ... + 49091841.

It is an arithmetic number, because the mean of its divisors is an integer number (2020290758264).

Almost surely, 2^{21211000001121} is an apocalyptic number.

21211000001121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21211000001121 is a deficient number, since it is larger than the sum of its proper divisors (11113652131103).

21211000001121 is a wasteful number, since it uses less digits than its factorization.

21211000001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97760040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211000001121 its reverse (12110000011212), we get a palindrome (33321000012333).

It can be divided in two parts, 2 and 1211000001121, that multiplied together give a palindrome (2422000002242).

The spelling of 21211000001121 in words is "twenty-one trillion, two hundred eleven billion, one thousand, one hundred twenty-one".