1221212221201 has 8 divisors (see below), whose sum is σ = 1414789892864. Its totient is φ = 1032414245280.

The previous prime is 1221212221199. The next prime is 1221212221217. The reversal of 1221212221201 is 1021222121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221212221201 - 2¹ = 1221212221199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221212221241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194923385 + ... + 1194924406.

It is an arithmetic number, because the mean of its divisors is an integer number (176848736608).

Almost surely, 2^{1221212221201} is an apocalyptic number.

It is an amenable number.

1221212221201 is a deficient number, since it is larger than the sum of its proper divisors (193577671663).

1221212221201 is an equidigital number, since it uses as much as digits as its factorization.

1221212221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389847871.

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

Adding to 1221212221201 its reverse (1021222121221), we get a palindrome (2242434342422).

The spelling of 1221212221201 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred one".