1221530123532 has 96 divisors (see below), whose sum is σ = 2897687520000. Its totient is φ = 400447086592.

The previous prime is 1221530123519. The next prime is 1221530123537. The reversal of 1221530123532 is 2353210351221.

It is a super-2 number, since 2×1221530123532² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221530123532.

It is not an unprimeable number, because it can be changed into a prime (1221530123537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208841344 + ... + 208847192.

It is an arithmetic number, because the mean of its divisors is an integer number (30184245000).

Almost surely, 2^{1221530123532} is an apocalyptic number.

1221530123532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221530123532 is an abundant number, since it is smaller than the sum of its proper divisors (1676157396468).

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

1221530123532 is a wasteful number, since it uses less digits than its factorization.

1221530123532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6855 (or 6853 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 1221530123532 its reverse (2353210351221), we get a palindrome (3574740474753).

The spelling of 1221530123532 in words is "one trillion, two hundred twenty-one billion, five hundred thirty million, one hundred twenty-three thousand, five hundred thirty-two".