221312212001 has 24 divisors (see below), whose sum is σ = 234799305216. Its totient is φ = 208543325760.

The previous prime is 221312211977. The next prime is 221312212057. The reversal of 221312212001 is 100212213122.

It is not a de Polignac number, because 221312212001 - 2⁶ = 221312211937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221312212501) 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, 38266556 + ... + 38272338.

It is an arithmetic number, because the mean of its divisors is an integer number (9783304384).

Almost surely, 2^221312212001 is an apocalyptic number.

It is an amenable number.

221312212001 is a deficient number, since it is larger than the sum of its proper divisors (13487093215).

221312212001 is an equidigital number, since it uses as much as digits as its factorization.

221312212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6893 (or 6870 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221312212001 its reverse (100212213122), we get a palindrome (321524425123).

The spelling of 221312212001 in words is "two hundred twenty-one billion, three hundred twelve million, two hundred twelve thousand, one".