221220000001 has 32 divisors (see below), whose sum is σ = 297193881600. Its totient is φ = 159027554880.

The previous prime is 221219999989. The next prime is 221220000031. The reversal of 221220000001 is 100000022122.

It is a cyclic number.

It is not a de Polignac number, because 221220000001 - 2¹⁷ = 221219868929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221220000031) 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, 1697940 + ... + 1823578.

It is an arithmetic number, because the mean of its divisors is an integer number (9287308800).

Almost surely, 2^221220000001 is an apocalyptic number.

It is an amenable number.

221220000001 is a deficient number, since it is larger than the sum of its proper divisors (75973881599).

221220000001 is a wasteful number, since it uses less digits than its factorization.

221220000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127429.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 221220000001 its reverse (100000022122), we get a palindrome (321220022123).

The spelling of 221220000001 in words is "two hundred twenty-one billion, two hundred twenty million, one", and thus it is an aban number.