1621232416 has 24 divisors (see below), whose sum is σ = 3193854300. Its totient is φ = 810094848.

The previous prime is 1621232413. The next prime is 1621232419. The reversal of 1621232416 is 6142321261.

It is an interprime number because it is at equal distance from previous prime (1621232413) and next prime (1621232419).

It can be written as a sum of positive squares in 2 ways, for example, as 1620867600 + 364816 = 40260^2 + 604^2 .

It is not an unprimeable number, because it can be changed into a prime (1621232413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36910 + ... + 67858.

Almost surely, 2^1621232416 is an apocalyptic number.

1621232416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1621232416 is a deficient number, since it is larger than the sum of its proper divisors (1572621884).

1621232416 is a wasteful number, since it uses less digits than its factorization.

1621232416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32596 (or 32588 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 1621232416 is about 40264.5304952138. The cubic root of 1621232416 is about 1174.7580406568.

Adding to 1621232416 its reverse (6142321261), we get a palindrome (7763553677).

The spelling of 1621232416 in words is "one billion, six hundred twenty-one million, two hundred thirty-two thousand, four hundred sixteen".