1201221000001 has 12 divisors (see below), whose sum is σ = 1341995451412. Its totient is φ = 1074117132000.

The previous prime is 1201220999989. The next prime is 1201221000013. The reversal of 1201221000001 is 1000001221021.

It is an interprime number because it is at equal distance from previous prime (1201220999989) and next prime (1201221000013).

It can be written as a sum of positive squares in 2 ways, for example, as 386823046401 + 814397953600 = 621951^2 + 902440^2 .

It is not a de Polignac number, because 1201221000001 - 2⁵ = 1201220999969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201221000901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81365130 + ... + 81379891.

Almost surely, 2^{1201221000001} is an apocalyptic number.

1201221000001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201221000001 is a deficient number, since it is larger than the sum of its proper divisors (140774451411).

1201221000001 is a wasteful number, since it uses less digits than its factorization.

1201221000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162745104 (or 162745093 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1201221000001 its reverse (1000001221021), we get a palindrome (2201222221022).

The spelling of 1201221000001 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one", and thus it is an aban number.