1012221216 has 36 divisors (see below), whose sum is σ = 2878504902. Its totient is φ = 337406976.

The previous prime is 1012221211. The next prime is 1012221229. The reversal of 1012221216 is 6121222101.

It can be written as a sum of positive squares in only one way, i.e., 986211216 + 26010000 = 31404^2 + 5100^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1012221211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1757041 + ... + 1757616.

Almost surely, 2^1012221216 is an apocalyptic number.

1012221216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1012221216 is an abundant number, since it is smaller than the sum of its proper divisors (1866283686).

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

1012221216 is a wasteful number, since it uses less digits than its factorization.

1012221216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514673 (or 3514662 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1012221216 is about 31815.4241838766. The cubic root of 1012221216 is about 1004.0572550853.

Adding to 1012221216 its reverse (6121222101), we get a palindrome (7133443317).

The spelling of 1012221216 in words is "one billion, twelve million, two hundred twenty-one thousand, two hundred sixteen".