1223021616 has 40 divisors (see below), whose sum is σ = 3345326064. Its totient is φ = 383692800.

The previous prime is 1223021593. The next prime is 1223021689. The reversal of 1223021616 is 6161203221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 748585 + ... + 750216.

Almost surely, 2^1223021616 is an apocalyptic number.

1223021616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1223021616 is an abundant number, since it is smaller than the sum of its proper divisors (2122304448).

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

1223021616 is a wasteful number, since it uses less digits than its factorization.

1223021616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498829 (or 1498823 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1223021616 is about 34971.7259511166. The cubic root of 1223021616 is about 1069.4111576510.

Adding to 1223021616 its reverse (6161203221), we get a palindrome (7384224837).

The spelling of 1223021616 in words is "one billion, two hundred twenty-three million, twenty-one thousand, six hundred sixteen".