1222261251640 has 384 divisors, whose sum is σ = 3493277565120. Its totient is φ = 379170201600.

The previous prime is 1222261251637. The next prime is 1222261251647. The reversal of 1222261251640 is 461521622221.

It is a junction number, because it is equal to n+sod(n) for n = 1222261251596 and 1222261251605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222261251647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 84654502 + ... + 84668938.

Almost surely, 2^{1222261251640} is an apocalyptic number.

1222261251640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222261251640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746638782560).

1222261251640 is an abundant number, since it is smaller than the sum of its proper divisors (2271016313480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222261251640 is a wasteful number, since it uses less digits than its factorization.

1222261251640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14551 (or 14528 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 1222261251640 its reverse (461521622221), we get a palindrome (1683782873861).

The spelling of 1222261251640 in words is "one trillion, two hundred twenty-two billion, two hundred sixty-one million, two hundred fifty-one thousand, six hundred forty".