1221223302420 has 48 divisors (see below), whose sum is σ = 3730282089408. Its totient is φ = 296054133760.

The previous prime is 1221223302379. The next prime is 1221223302443. The reversal of 1221223302420 is 242033221221.

It is a super-2 number, since 2×1221223302420² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 925168509 + ... + 925169828.

It is an arithmetic number, because the mean of its divisors is an integer number (77714210196).

Almost surely, 2^{1221223302420} is an apocalyptic number.

1221223302420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221223302420 is an abundant number, since it is smaller than the sum of its proper divisors (2509058786988).

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

1221223302420 is a wasteful number, since it uses less digits than its factorization.

1221223302420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850338360 (or 1850338358 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 1221223302420 its reverse (242033221221), we get a palindrome (1463256523641).

The spelling of 1221223302420 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-three million, three hundred two thousand, four hundred twenty".