1221630361221 has 24 divisors (see below), whose sum is σ = 1680155993376. Its totient is φ = 789426214720.

The previous prime is 1221630361183. The next prime is 1221630361271.

1221630361221 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-1221630361221 is a prime.

It is a super-2 number, since 2×1221630361221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221630361271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173850 + ... + 1572731.

It is an arithmetic number, because the mean of its divisors is an integer number (70006499724).

Almost surely, 2^{1221630361221} is an apocalyptic number.

It is an amenable number.

1221630361221 is a deficient number, since it is larger than the sum of its proper divisors (458525632155).

1221630361221 is an equidigital number, since it uses as much as digits as its factorization.

1221630361221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746773 (or 1746720 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

It can be divided in two parts, 1221630 and 361221, that added together give a palindrome (1582851).

The spelling of 1221630361221 in words is "one trillion, two hundred twenty-one billion, six hundred thirty million, three hundred sixty-one thousand, two hundred twenty-one".