1221012001201 has 4 divisors (see below), whose sum is σ = 1221678858304. Its totient is φ = 1220345144100.

The previous prime is 1221012001189. The next prime is 1221012001213. The reversal of 1221012001201 is 1021002101221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1221012001189) and next prime (1221012001213).

It is a cyclic number.

It is not a de Polignac number, because 1221012001201 - 2⁷ = 1221012001073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221712001201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333425805 + ... + 333429466.

It is an arithmetic number, because the mean of its divisors is an integer number (305419714576).

Almost surely, 2^{1221012001201} is an apocalyptic number.

It is an amenable number.

1221012001201 is a deficient number, since it is larger than the sum of its proper divisors (666857103).

1221012001201 is an equidigital number, since it uses as much as digits as its factorization.

1221012001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666857102.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221012001201 its reverse (1021002101221), we get a palindrome (2242014102422).

The spelling of 1221012001201 in words is "one trillion, two hundred twenty-one billion, twelve million, one thousand, two hundred one".