1221001221201 has 8 divisors (see below), whose sum is σ = 1639884852384. Its totient is φ = 808059202080.

The previous prime is 1221001221197. The next prime is 1221001221203. The reversal of 1221001221201 is 1021221001221.

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

It is not a de Polignac number, because 1221001221201 - 2² = 1221001221197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221001221203) 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, 1485402535 + ... + 1485403356.

It is an arithmetic number, because the mean of its divisors is an integer number (204985606548).

Almost surely, 2^{1221001221201} is an apocalyptic number.

It is an amenable number.

1221001221201 is a deficient number, since it is larger than the sum of its proper divisors (418883631183).

1221001221201 is a wasteful number, since it uses less digits than its factorization.

1221001221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2970806031.

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

Adding to 1221001221201 its reverse (1021221001221), we get a palindrome (2242222222422).

The spelling of 1221001221201 in words is "one trillion, two hundred twenty-one billion, one million, two hundred twenty-one thousand, two hundred one".