21222012222201 has 12 divisors (see below), whose sum is σ = 32915774059152. Its totient is φ = 12126864126888.

The previous prime is 21222012222199. The next prime is 21222012222209. The reversal of 21222012222201 is 10222221022212.

It is not a de Polignac number, because 21222012222201 - 2¹ = 21222012222199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21222012222209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72183714895 + ... + 72183715188.

It is an arithmetic number, because the mean of its divisors is an integer number (2742981171596).

Almost surely, 2^{21222012222201} is an apocalyptic number.

21222012222201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21222012222201 is a deficient number, since it is larger than the sum of its proper divisors (11693761836951).

21222012222201 is a wasteful number, since it uses less digits than its factorization.

21222012222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144367430100 (or 144367430093 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21222012222201 its reverse (10222221022212), we get a palindrome (31444233244413).

The spelling of 21222012222201 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, two hundred twenty-two thousand, two hundred one".