221212012100001 has 32 divisors (see below), whose sum is σ = 320613453175680. Its totient is φ = 134855228795904.

The previous prime is 221212012099999. The next prime is 221212012100003. The reversal of 221212012100001 is 100001210212122.

It is an interprime number because it is at equal distance from previous prime (221212012099999) and next prime (221212012100003).

It is not a de Polignac number, because 221212012100001 - 2¹ = 221212012099999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221212012100003) 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, 195286665 + ... + 196416153.

It is an arithmetic number, because the mean of its divisors is an integer number (10019170411740).

Almost surely, 2^{221212012100001} is an apocalyptic number.

It is an amenable number.

221212012100001 is a deficient number, since it is larger than the sum of its proper divisors (99401441075679).

221212012100001 is a wasteful number, since it uses less digits than its factorization.

221212012100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176545.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221212012100001 its reverse (100001210212122), we get a palindrome (321213222312123).

The spelling of 221212012100001 in words is "two hundred twenty-one trillion, two hundred twelve billion, twelve million, one hundred thousand, one".