1221082152 has 32 divisors (see below), whose sum is σ = 3069770400. Its totient is φ = 404752064.

The previous prime is 1221082129. The next prime is 1221082153. The reversal of 1221082152 is 2512801221.

It is a super-2 number, since 2×1221082152² = 2982083243865902208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1221082153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137823 + ... + 146414.

It is an arithmetic number, because the mean of its divisors is an integer number (95930325).

Almost surely, 2^1221082152 is an apocalyptic number.

1221082152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221082152 is an abundant number, since it is smaller than the sum of its proper divisors (1848688248).

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

1221082152 is a wasteful number, since it uses less digits than its factorization.

1221082152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284425 (or 284421 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 1221082152 is about 34943.9859203268. The cubic root of 1221082152 is about 1068.8455689102.

Adding to 1221082152 its reverse (2512801221), we get a palindrome (3733883373).

The spelling of 1221082152 in words is "one billion, two hundred twenty-one million, eighty-two thousand, one hundred fifty-two".