221212222020001 has 16 divisors (see below), whose sum is σ = 223753173462720. Its totient is φ = 218680603727040.

The previous prime is 221212222019993. The next prime is 221212222020037. The reversal of 221212222020001 is 100020222212122.

It is a cyclic number.

It is not a de Polignac number, because 221212222020001 - 2³ = 221212222019993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212222020701) 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, 1930022371 + ... + 1930136983.

It is an arithmetic number, because the mean of its divisors is an integer number (13984573341420).

Almost surely, 2^{221212222020001} is an apocalyptic number.

It is an amenable number.

221212222020001 is a deficient number, since it is larger than the sum of its proper divisors (2540951442719).

221212222020001 is a wasteful number, since it uses less digits than its factorization.

221212222020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155136.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221212222020001 its reverse (100020222212122), we get a palindrome (321232444232123).

The spelling of 221212222020001 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, twenty thousand, one".