1221134520 has 32 divisors (see below), whose sum is σ = 3663403920. Its totient is φ = 325635840.

The previous prime is 1221134507. The next prime is 1221134543. The reversal of 1221134520 is 254311221.

It is a congruent number.

It is an unprimeable number.

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, 5087941 + ... + 5088180.

Almost surely, 2^1221134520 is an apocalyptic number.

1221134520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221134520 is an abundant number, since it is smaller than the sum of its proper divisors (2442269400).

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

1221134520 is a wasteful number, since it uses less digits than its factorization.

1221134520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10176135 (or 10176131 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1221134520 is about 34944.7352257819. The cubic root of 1221134520 is about 1068.8608483912.

Adding to 1221134520 its reverse (254311221), we get a palindrome (1475445741).

The spelling of 1221134520 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, five hundred twenty".