1216217016 has 96 divisors (see below), whose sum is σ = 3771986400. Its totient is φ = 346798080.

The previous prime is 1216216987. The next prime is 1216217021. The reversal of 1216217016 is 6107126121.

It is a happy number.

1216217016 is a `hidden beast` number, since 1 + 21 + 621 + 7 + 0 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284656 + ... + 288896.

It is an arithmetic number, because the mean of its divisors is an integer number (39291525).

Almost surely, 2^1216217016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216217016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1885993200).

1216217016 is an abundant number, since it is smaller than the sum of its proper divisors (2555769384).

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

1216217016 is a wasteful number, since it uses less digits than its factorization.

1216217016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829 (or 4822 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1216217016 is about 34874.3030898110. The cubic root of 1216217016 is about 1067.4241519675.

The spelling of 1216217016 in words is "one billion, two hundred sixteen million, two hundred seventeen thousand, sixteen".