1206416321 has 4 divisors (see below), whose sum is σ = 1316090544. Its totient is φ = 1096742100.

The previous prime is 1206416287. The next prime is 1206416329. The reversal of 1206416321 is 1236146021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1206416321 - 2³⁰ = 132674497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206416329) 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, 54837095 + ... + 54837116.

It is an arithmetic number, because the mean of its divisors is an integer number (329022636).

Almost surely, 2^1206416321 is an apocalyptic number.

1206416321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1206416321 is a deficient number, since it is larger than the sum of its proper divisors (109674223).

1206416321 is a wasteful number, since it uses less digits than its factorization.

1206416321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109674222.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1206416321 is about 34733.5043006029. The cubic root of 1206416321 is about 1064.5491919677.

The spelling of 1206416321 in words is "one billion, two hundred six million, four hundred sixteen thousand, three hundred twenty-one".