1216361026 has 16 divisors (see below), whose sum is σ = 1904760000. Its totient is φ = 581465808.

The previous prime is 1216361023. The next prime is 1216361039. The reversal of 1216361026 is 6201636121.

It is a junction number, because it is equal to n+sod(n) for n = 1216360985 and 1216361003.

It is not an unprimeable number, because it can be changed into a prime (1216361023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121645 + ... + 131263.

It is an arithmetic number, because the mean of its divisors is an integer number (119047500).

Almost surely, 2^1216361026 is an apocalyptic number.

1216361026 is a deficient number, since it is larger than the sum of its proper divisors (688398974).

1216361026 is a wasteful number, since it uses less digits than its factorization.

1216361026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12393.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1216361026 is about 34876.3677294526. The cubic root of 1216361026 is about 1067.4662808758.

Adding to 1216361026 its reverse (6201636121), we get a palindrome (7417997147).

The spelling of 1216361026 in words is "one billion, two hundred sixteen million, three hundred sixty-one thousand, twenty-six".