221212120120001 has 32 divisors (see below), whose sum is σ = 239549487851520. Its totient is φ = 203648701132800.

The previous prime is 221212120119973. The next prime is 221212120120021. The reversal of 221212120120001 is 100021021212122.

It is not a de Polignac number, because 221212120120001 - 2⁶ = 221212120119937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212120120021) 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, 304356641 + ... + 305082593.

It is an arithmetic number, because the mean of its divisors is an integer number (7485921495360).

Almost surely, 2^{221212120120001} is an apocalyptic number.

It is an amenable number.

221212120120001 is a deficient number, since it is larger than the sum of its proper divisors (18337367731519).

221212120120001 is a wasteful number, since it uses less digits than its factorization.

221212120120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727457.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221212120120001 its reverse (100021021212122), we get a palindrome (321233141332123).

The spelling of 221212120120001 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty thousand, one".