21211011010218 has 16 divisors (see below), whose sum is σ = 42422209106400. Its totient is φ = 7070305822416.

The previous prime is 21211011010201. The next prime is 21211011010219. The reversal of 21211011010218 is 81201011011212.

It is a junction number, because it is equal to n+sod(n) for n = 21211011010194 and 21211011010203.

It is not an unprimeable number, because it can be changed into a prime (21211011010219) 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, 6299280 + ... + 9061067.

It is an arithmetic number, because the mean of its divisors is an integer number (2651388069150).

Almost surely, 2^{21211011010218} is an apocalyptic number.

21211011010218 is an abundant number, since it is smaller than the sum of its proper divisors (21211198096182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211011010218 is a wasteful number, since it uses less digits than its factorization.

21211011010218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15590501.

The product of its (nonzero) digits is 64, while the sum is 21.

The spelling of 21211011010218 in words is "twenty-one trillion, two hundred eleven billion, eleven million, ten thousand, two hundred eighteen".