1221252000 has 96 divisors (see below), whose sum is σ = 4000860864. Its totient is φ = 325664000.

The previous prime is 1221251981. The next prime is 1221252013. The reversal of 1221252000 is 2521221.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 38886 + ... + 62885.

It is an arithmetic number, because the mean of its divisors is an integer number (41675634).

Almost surely, 2^1221252000 is an apocalyptic number.

1221252000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221252000 is an abundant number, since it is smaller than the sum of its proper divisors (2779608864).

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

1221252000 is a wasteful number, since it uses less digits than its factorization.

1221252000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101799 (or 101781 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1221252000 is about 34946.4161252624. The cubic root of 1221252000 is about 1068.8951240978.

Adding to 1221252000 its reverse (2521221), we get a palindrome (1223773221).

The spelling of 1221252000 in words is "one billion, two hundred twenty-one million, two hundred fifty-two thousand".