1221105006631 has 4 divisors (see below), whose sum is σ = 1221774841152. Its totient is φ = 1220435172112.

The previous prime is 1221105006619. The next prime is 1221105006677. The reversal of 1221105006631 is 1366005011221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221105006631 - 2⁵ = 1221105006599 is a prime.

It is a super-2 number, since 2×1221105006631² (a number of 25 digits) contains 22 as substring.

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 1221105006631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221105006691) 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, 334914526 + ... + 334918171.

It is an arithmetic number, because the mean of its divisors is an integer number (305443710288).

Almost surely, 2^{1221105006631} is an apocalyptic number.

1221105006631 is a deficient number, since it is larger than the sum of its proper divisors (669834521).

1221105006631 is an equidigital number, since it uses as much as digits as its factorization.

1221105006631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669834520.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 1221105006631 in words is "one trillion, two hundred twenty-one billion, one hundred five million, six thousand, six hundred thirty-one".