1221602416 has 40 divisors (see below), whose sum is σ = 2495710800. Its totient is φ = 577658880.

The previous prime is 1221602411. The next prime is 1221602419. The reversal of 1221602416 is 6142061221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221602411) by changing a digit.

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, 191730 + ... + 197998.

It is an arithmetic number, because the mean of its divisors is an integer number (62392770).

Almost surely, 2^1221602416 is an apocalyptic number.

1221602416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221602416 is an abundant number, since it is smaller than the sum of its proper divisors (1274108384).

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

1221602416 is a wasteful number, since it uses less digits than its factorization.

1221602416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6937 (or 6931 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1221602416 is about 34951.4293842183. The cubic root of 1221602416 is about 1068.9973476453.

Adding to 1221602416 its reverse (6142061221), we get a palindrome (7363663637).

The spelling of 1221602416 in words is "one billion, two hundred twenty-one million, six hundred two thousand, four hundred sixteen".