21211211111194 has 16 divisors (see below), whose sum is σ = 34276497088680. Its totient is φ = 9786294604800.

The previous prime is 21211211111179. The next prime is 21211211111197. The reversal of 21211211111194 is 49111111211212.

It can be written as a sum of positive squares in 4 ways, for example, as 18958735430569 + 2252475680625 = 4354163^2 + 1500825^2 .

It is not an unprimeable number, because it can be changed into a prime (21211211111197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145556559 + ... + 145702210.

Almost surely, 2^{21211211111194} is an apocalyptic number.

21211211111194 is a deficient number, since it is larger than the sum of its proper divisors (13065285977486).

21211211111194 is a wasteful number, since it uses less digits than its factorization.

21211211111194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291261585.

The product of its digits is 288, while the sum is 28.

The spelling of 21211211111194 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, one hundred eleven thousand, one hundred ninety-four".