21110211121009 has 16 divisors (see below), whose sum is σ = 22249393675200. Its totient is φ = 19973843193024.

The previous prime is 21110211120991. The next prime is 21110211121019. The reversal of 21110211121009 is 90012111201112.

It is a happy number.

It is not a de Polignac number, because 21110211121009 - 2²¹ = 21110209023857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110211121019) 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, 453092487 + ... + 453139075.

It is an arithmetic number, because the mean of its divisors is an integer number (1390587104700).

Almost surely, 2^{21110211121009} is an apocalyptic number.

It is an amenable number.

21110211121009 is a deficient number, since it is larger than the sum of its proper divisors (1139182554191).

21110211121009 is a wasteful number, since it uses less digits than its factorization.

21110211121009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76272.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 21110211121009 in words is "twenty-one trillion, one hundred ten billion, two hundred eleven million, one hundred twenty-one thousand, nine".