1221552432052 has 24 divisors (see below), whose sum is σ = 2203654640040. Its totient is φ = 592059553920.

The previous prime is 1221552432029. The next prime is 1221552432059. The reversal of 1221552432052 is 2502342551221.

It can be written as a sum of positive squares in 4 ways, for example, as 556521968016 + 665030464036 = 746004^2 + 815494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221552431999 and 1221552432017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221552432059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15301699 + ... + 15381322.

It is an arithmetic number, because the mean of its divisors is an integer number (91818943335).

Almost surely, 2^{1221552432052} is an apocalyptic number.

It is an amenable number.

1221552432052 is a deficient number, since it is larger than the sum of its proper divisors (982102207988).

1221552432052 is a wasteful number, since it uses less digits than its factorization.

1221552432052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30683331 (or 30683329 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 1221552432052 its reverse (2502342551221), we get a palindrome (3723894983273).

The spelling of 1221552432052 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-two million, four hundred thirty-two thousand, fifty-two".