1216021248 has 270 divisors, whose sum is σ = 3937645404. Its totient is φ = 373082112.

The previous prime is 1216021217. The next prime is 1216021259. The reversal of 1216021248 is 8421206121.

1216021248 is a `hidden beast` number, since 1 + 2 + 1 + 602 + 12 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3504211 + ... + 3504557.

Almost surely, 2^1216021248 is an apocalyptic number.

1216021248 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216021248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1968822702).

1216021248 is an abundant number, since it is smaller than the sum of its proper divisors (2721624156).

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

1216021248 is an equidigital number, since it uses as much as digits as its factorization.

1216021248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1216021248 is about 34871.4962110891. The cubic root of 1216021248 is about 1067.3668763603.

Adding to 1216021248 its reverse (8421206121), we get a palindrome (9637227369).

The spelling of 1216021248 in words is "one billion, two hundred sixteen million, twenty-one thousand, two hundred forty-eight".