1213210806 has 16 divisors (see below), whose sum is σ = 2439979200. Its totient is φ = 402144008.

The previous prime is 1213210783. The next prime is 1213210829. The reversal of 1213210806 is 6080123121.

It is an interprime number because it is at equal distance from previous prime (1213210783) and next prime (1213210829).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563736 + ... + 565883.

It is an arithmetic number, because the mean of its divisors is an integer number (152498700).

Almost surely, 2^1213210806 is an apocalyptic number.

1213210806 is an abundant number, since it is smaller than the sum of its proper divisors (1226768394).

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

1213210806 is a wasteful number, since it uses less digits than its factorization.

1213210806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129803.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1213210806 is about 34831.1757768813. The cubic root of 1213210806 is about 1066.5439503139.

Adding to 1213210806 its reverse (6080123121), we get a palindrome (7293333927).

The spelling of 1213210806 in words is "one billion, two hundred thirteen million, two hundred ten thousand, eight hundred six".