1221320952 has 48 divisors (see below), whose sum is σ = 3353070240. Its totient is φ = 401528448.

The previous prime is 1221320951. The next prime is 1221321001. The reversal of 1221320952 is 2590231221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221320951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110928 + ... + 121439.

It is an arithmetic number, because the mean of its divisors is an integer number (69855630).

Almost surely, 2^1221320952 is an apocalyptic number.

1221320952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221320952 is an abundant number, since it is smaller than the sum of its proper divisors (2131749288).

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

1221320952 is a wasteful number, since it uses less digits than its factorization.

1221320952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232452 (or 232445 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1221320952 is about 34947.4026502686. The cubic root of 1221320952 is about 1068.9152403582.

The spelling of 1221320952 in words is "one billion, two hundred twenty-one million, three hundred twenty thousand, nine hundred fifty-two".