21222120212001 has 24 divisors (see below), whose sum is σ = 30669018752736. Its totient is φ = 14141229981120.

The previous prime is 21222120211997. The next prime is 21222120212003. The reversal of 21222120212001 is 10021202122212.

It is a happy number.

21222120212001 is a `hidden beast` number, since 212 + 221 + 20 + 212 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 21222120212001 - 2² = 21222120211997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222120212003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194781526 + ... + 194890448.

It is an arithmetic number, because the mean of its divisors is an integer number (1277875781364).

Almost surely, 2^{21222120212001} is an apocalyptic number.

It is an amenable number.

21222120212001 is a deficient number, since it is larger than the sum of its proper divisors (9446898540735).

21222120212001 is a wasteful number, since it uses less digits than its factorization.

21222120212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119213 (or 119210 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120212001 its reverse (10021202122212), we get a palindrome (31243322334213).

The spelling of 21222120212001 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred twelve thousand, one".