1213220715 has 16 divisors (see below), whose sum is σ = 2218460928. Its totient is φ = 554615136.

The previous prime is 1213220707. The next prime is 1213220719. The reversal of 1213220715 is 5170223121.

It is not a de Polignac number, because 1213220715 - 2³ = 1213220707 is a prime.

It is a super-2 number, since 2×1213220715² = 2943809006610222450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213220719) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5777137 + ... + 5777346.

It is an arithmetic number, because the mean of its divisors is an integer number (138653808).

Almost surely, 2^1213220715 is an apocalyptic number.

1213220715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213220715 is a deficient number, since it is larger than the sum of its proper divisors (1005240213).

1213220715 is a wasteful number, since it uses less digits than its factorization.

1213220715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11554498.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1213220715 is about 34831.3180198510. The cubic root of 1213220715 is about 1066.5468540014.

Adding to 1213220715 its reverse (5170223121), we get a palindrome (6383443836).

The spelling of 1213220715 in words is "one billion, two hundred thirteen million, two hundred twenty thousand, seven hundred fifteen".