1221739974252 has 192 divisors, whose sum is σ = 3811928064000. Its totient is φ = 330572176704.

The previous prime is 1221739974251. The next prime is 1221739974283. The reversal of 1221739974252 is 2524799371221.

1221739974252 is a `hidden beast` number, since 1 + 221 + 7 + 399 + 7 + 4 + 25 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1221739974251) 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 63 ways as a sum of consecutive naturals, for example, 42028899 + ... + 42057957.

It is an arithmetic number, because the mean of its divisors is an integer number (19853792000).

Almost surely, 2^{1221739974252} is an apocalyptic number.

1221739974252 is a gapful number since it is divisible by the number (12) 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 1221739974252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905964032000).

1221739974252 is an abundant number, since it is smaller than the sum of its proper divisors (2590188089748).

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

1221739974252 is a wasteful number, since it uses less digits than its factorization.

1221739974252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32025 (or 32017 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The spelling of 1221739974252 in words is "one trillion, two hundred twenty-one billion, seven hundred thirty-nine million, nine hundred seventy-four thousand, two hundred fifty-two".