1221802213340 has 12 divisors (see below), whose sum is σ = 2565784648056. Its totient is φ = 488720885328.

The previous prime is 1221802213321. The next prime is 1221802213351. The reversal of 1221802213340 is 433122081221.

It is a congruent number.

It is an unprimeable number.

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, 30545055314 + ... + 30545055353.

It is an arithmetic number, because the mean of its divisors is an integer number (213815387338).

Almost surely, 2^{1221802213340} is an apocalyptic number.

1221802213340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221802213340 is an abundant number, since it is smaller than the sum of its proper divisors (1343982434716).

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

1221802213340 is a wasteful number, since it uses less digits than its factorization.

1221802213340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61090110676 (or 61090110674 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 1221802213340 its reverse (433122081221), we get a palindrome (1654924294561).

The spelling of 1221802213340 in words is "one trillion, two hundred twenty-one billion, eight hundred two million, two hundred thirteen thousand, three hundred forty".