1221285252 has 24 divisors (see below), whose sum is σ = 3108726432. Its totient is φ = 370086400.

The previous prime is 1221285251. The next prime is 1221285283. The reversal of 1221285252 is 2525821221.

It is not an unprimeable number, because it can be changed into a prime (1221285251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4625949 + ... + 4626212.

It is an arithmetic number, because the mean of its divisors is an integer number (129530268).

Almost surely, 2^1221285252 is an apocalyptic number.

1221285252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221285252 is an abundant number, since it is smaller than the sum of its proper divisors (1887441180).

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

1221285252 is a wasteful number, since it uses less digits than its factorization.

1221285252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9252179 (or 9252177 counting only the distinct ones).

The product of its digits is 6400, while the sum is 30.

The square root of 1221285252 is about 34946.8918789640. The cubic root of 1221285252 is about 1068.9048252292.

The spelling of 1221285252 in words is "one billion, two hundred twenty-one million, two hundred eighty-five thousand, two hundred fifty-two".