1221201110001 has 8 divisors (see below), whose sum is σ = 1629799917760. Its totient is φ = 813368187792.

The previous prime is 1221201109993. The next prime is 1221201110011. The reversal of 1221201110001 is 1000111021221.

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

It is not a de Polignac number, because 1221201110001 - 2³ = 1221201109993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221201110011) 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, 191467666 + ... + 191474043.

It is an arithmetic number, because the mean of its divisors is an integer number (203724989720).

Almost surely, 2^{1221201110001} is an apocalyptic number.

It is an amenable number.

1221201110001 is a deficient number, since it is larger than the sum of its proper divisors (408598807759).

1221201110001 is a wasteful number, since it uses less digits than its factorization.

1221201110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382942775.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221201110001 its reverse (1000111021221), we get a palindrome (2221312131222).

The spelling of 1221201110001 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred ten thousand, one".