221210000001 has 32 divisors (see below), whose sum is σ = 359965440000. Its totient is φ = 133637155344.

The previous prime is 221209999993. The next prime is 221210000003. The reversal of 221210000001 is 100000012122.

It is not a de Polignac number, because 221210000001 - 2³ = 221209999993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (221210000003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9362301 + ... + 9385898.

It is an arithmetic number, because the mean of its divisors is an integer number (11248920000).

Almost surely, 2^221210000001 is an apocalyptic number.

It is an amenable number.

221210000001 is a deficient number, since it is larger than the sum of its proper divisors (138755439999).

221210000001 is a wasteful number, since it uses less digits than its factorization.

221210000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18748250 (or 18748244 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 221210000001 its reverse (100000012122), we get a palindrome (321210012123).

The spelling of 221210000001 in words is "two hundred twenty-one billion, two hundred ten million, one", and thus it is an aban number.