1221012212201 has 8 divisors (see below), whose sum is σ = 1274341178880. Its totient is φ = 1167703368832.

The previous prime is 1221012212197. The next prime is 1221012212279. The reversal of 1221012212201 is 1022122101221.

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 1221012212201 - 2² = 1221012212197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221012212201.

It is not an unprimeable number, because it can be changed into a prime (1221012262201) 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, 4906760 + ... + 5149593.

It is an arithmetic number, because the mean of its divisors is an integer number (159292647360).

Almost surely, 2^{1221012212201} is an apocalyptic number.

It is an amenable number.

1221012212201 is a deficient number, since it is larger than the sum of its proper divisors (53328966679).

1221012212201 is a wasteful number, since it uses less digits than its factorization.

1221012212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061655.

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

Adding to 1221012212201 its reverse (1022122101221), we get a palindrome (2243134313422).

The spelling of 1221012212201 in words is "one trillion, two hundred twenty-one billion, twelve million, two hundred twelve thousand, two hundred one".