1201221021101 has 4 divisors (see below), whose sum is σ = 1218139627104. Its totient is φ = 1184302415100.

The previous prime is 1201221021097. The next prime is 1201221021127. The reversal of 1201221021101 is 1011201221021.

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 a cyclic number.

It is not a de Polignac number, because 1201221021101 - 2² = 1201221021097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221021131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8459302895 + ... + 8459303036.

It is an arithmetic number, because the mean of its divisors is an integer number (304534906776).

Almost surely, 2^{1201221021101} is an apocalyptic number.

It is an amenable number.

1201221021101 is a deficient number, since it is larger than the sum of its proper divisors (16918606003).

1201221021101 is an equidigital number, since it uses as much as digits as its factorization.

1201221021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16918606002.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1201221021101 its reverse (1011201221021), we get a palindrome (2212422242122).

It can be divided in two parts, 1201221021 and 101, that multiplied together give a palindrome (121323323121).

The spelling of 1201221021101 in words is "one trillion, two hundred one billion, two hundred twenty-one million, twenty-one thousand, one hundred one".