21212011222011 has 6 divisors (see below), whose sum is σ = 30639571765140. Its totient is φ = 14141340814668.

The previous prime is 21212011221991. The next prime is 21212011222049. The reversal of 21212011222011 is 11022211021212.

21212011222011 is a `hidden beast` number, since 212 + 120 + 112 + 220 + 1 + 1 = 666.

It is not a de Polignac number, because 21212011222011 - 2⁵ = 21212011221979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212011222711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178445067881 + ... + 1178445067898.

It is an arithmetic number, because the mean of its divisors is an integer number (5106595294190).

Almost surely, 2^{21212011222011} is an apocalyptic number.

21212011222011 is a deficient number, since it is larger than the sum of its proper divisors (9427560543129).

21212011222011 is a wasteful number, since it uses less digits than its factorization.

21212011222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356890135785 (or 2356890135782 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21212011222011 its reverse (11022211021212), we get a palindrome (32234222243223).

The spelling of 21212011222011 in words is "twenty-one trillion, two hundred twelve billion, eleven million, two hundred twenty-two thousand, eleven".