1216220964 has 36 divisors (see below), whose sum is σ = 3301172784. Its totient is φ = 347491536.

The previous prime is 1216220939. The next prime is 1216221001. The reversal of 1216220964 is 4690226121.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1033614 + ... + 1034789.

It is an arithmetic number, because the mean of its divisors is an integer number (91699244).

Almost surely, 2^1216220964 is an apocalyptic number.

1216220964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1216220964 is an abundant number, since it is smaller than the sum of its proper divisors (2084951820).

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

1216220964 is a wasteful number, since it uses less digits than its factorization.

1216220964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068424 (or 2068415 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1216220964 is about 34874.3596930467. The cubic root of 1216220964 is about 1067.4253069659.

The spelling of 1216220964 in words is "one billion, two hundred sixteen million, two hundred twenty thousand, nine hundred sixty-four".