21012211121101 has 32 divisors (see below), whose sum is σ = 22862751564800. Its totient is φ = 19237901760000.

The previous prime is 21012211121089. The next prime is 21012211121123. The reversal of 21012211121101 is 10112111221012.

It is a cyclic number.

It is not a de Polignac number, because 21012211121101 - 2³⁷ = 20874772167629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012211121801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2122226251 + ... + 2122236151.

It is an arithmetic number, because the mean of its divisors is an integer number (714460986400).

Almost surely, 2^{21012211121101} is an apocalyptic number.

It is an amenable number.

21012211121101 is a deficient number, since it is larger than the sum of its proper divisors (1850540443699).

21012211121101 is a wasteful number, since it uses less digits than its factorization.

21012211121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14501.

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

Adding to 21012211121101 its reverse (10112111221012), we get a palindrome (31124322342113).

The spelling of 21012211121101 in words is "twenty-one trillion, twelve billion, two hundred eleven million, one hundred twenty-one thousand, one hundred one".