21211011022212 has 72 divisors (see below), whose sum is σ = 58504277063232. Its totient is φ = 6426116760000.

The previous prime is 21211011022207. The next prime is 21211011022297. The reversal of 21211011022212 is 21222011011212.

21211011022212 is a `hidden beast` number, since 212 + 110 + 110 + 22 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4349664 + ... + 7832087.

It is an arithmetic number, because the mean of its divisors is an integer number (812559403656).

Almost surely, 2^{21211011022212} is an apocalyptic number.

21211011022212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211011022212 is an abundant number, since it is smaller than the sum of its proper divisors (37293266041020).

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

21211011022212 is a wasteful number, since it uses less digits than its factorization.

21211011022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12186169 (or 12186164 counting only the distinct ones).

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

Adding to 21211011022212 its reverse (21222011011212), we get a palindrome (42433022033424).

The spelling of 21211011022212 in words is "twenty-one trillion, two hundred eleven billion, eleven million, twenty-two thousand, two hundred twelve".