221212221021001 has 32 divisors (see below), whose sum is σ = 264141429608448. Its totient is φ = 181135877778240.

The previous prime is 221212221020929. The next prime is 221212221021061. The reversal of 221212221021001 is 100120122212122.

It is not a de Polignac number, because 221212221021001 - 2¹¹ = 221212221018953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221212221021001.

It is not an unprimeable number, because it can be changed into a prime (221212221021061) 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, 2617760916 + ... + 2617845418.

It is an arithmetic number, because the mean of its divisors is an integer number (8254419675264).

Almost surely, 2^{221212221021001} is an apocalyptic number.

It is an amenable number.

221212221021001 is a deficient number, since it is larger than the sum of its proper divisors (42929208587447).

221212221021001 is a wasteful number, since it uses less digits than its factorization.

221212221021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105021.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221212221021001 its reverse (100120122212122), we get a palindrome (321332343233123).

The spelling of 221212221021001 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, one".