221001212001 has 16 divisors (see below), whose sum is σ = 295833283200. Its totient is φ = 146752687488.

The previous prime is 221001211987. The next prime is 221001212011. The reversal of 221001212001 is 100212100122.

It is not a de Polignac number, because 221001212001 - 2⁹ = 221001211489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221001212011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 718165 + ... + 978653.

It is an arithmetic number, because the mean of its divisors is an integer number (18489580200).

Almost surely, 2^221001212001 is an apocalyptic number.

It is an amenable number.

221001212001 is a deficient number, since it is larger than the sum of its proper divisors (74832071199).

221001212001 is a wasteful number, since it uses less digits than its factorization.

221001212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261608.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221001212001 its reverse (100212100122), we get a palindrome (321213312123).

The spelling of 221001212001 in words is "two hundred twenty-one billion, one million, two hundred twelve thousand, one".