1221105132101 has 4 divisors (see below), whose sum is σ = 1292934845772. Its totient is φ = 1149275418432.

The previous prime is 1221105132089. The next prime is 1221105132103. The reversal of 1221105132101 is 1012315011221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1050114612001 + 170990520100 = 1024751^2 + 413510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221105132101 is a prime.

It is a super-3 number, since 3×1221105132101³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221105132103) 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, 35914856810 + ... + 35914856843.

It is an arithmetic number, because the mean of its divisors is an integer number (323233711443).

Almost surely, 2^{1221105132101} is an apocalyptic number.

It is an amenable number.

1221105132101 is a deficient number, since it is larger than the sum of its proper divisors (71829713671).

1221105132101 is an equidigital number, since it uses as much as digits as its factorization.

1221105132101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71829713670.

The product of its (nonzero) digits is 120, while the sum is 20.

The spelling of 1221105132101 in words is "one trillion, two hundred twenty-one billion, one hundred five million, one hundred thirty-two thousand, one hundred one".