21120101121211 has 4 divisors (see below), whose sum is σ = 22362460010712. Its totient is φ = 19877742231712.

The previous prime is 21120101121209. The next prime is 21120101121227. The reversal of 21120101121211 is 11212110102112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120101121211 - 2¹ = 21120101121209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120101121011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621179444725 + ... + 621179444758.

It is an arithmetic number, because the mean of its divisors is an integer number (5590615002678).

Almost surely, 2^{21120101121211} is an apocalyptic number.

21120101121211 is a deficient number, since it is larger than the sum of its proper divisors (1242358889501).

21120101121211 is a wasteful number, since it uses less digits than its factorization.

21120101121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242358889500.

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

Adding to 21120101121211 its reverse (11212110102112), we get a palindrome (32332211223323).

The spelling of 21120101121211 in words is "twenty-one trillion, one hundred twenty billion, one hundred one million, one hundred twenty-one thousand, two hundred eleven".