1210216500 has 72 divisors (see below), whose sum is σ = 3817843848. Its totient is φ = 322723200.

The previous prime is 1210216493. The next prime is 1210216517. The reversal of 1210216500 is 56120121.

1210216500 is a `hidden beast` number, since 1 + 2 + 10 + 2 + 1 + 650 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 131882256 + 1078334244 = 11484^2 + 32838^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129969 + ... + 138968.

It is an arithmetic number, because the mean of its divisors is an integer number (53025609).

Almost surely, 2^1210216500 is an apocalyptic number.

1210216500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210216500 is an abundant number, since it is smaller than the sum of its proper divisors (2607627348).

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

1210216500 is a wasteful number, since it uses less digits than its factorization.

1210216500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268962 (or 268947 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1210216500 is about 34788.1660913593. The cubic root of 1210216500 is about 1065.6657874900.

Adding to 1210216500 its reverse (56120121), we get a palindrome (1266336621).

The spelling of 1210216500 in words is "one billion, two hundred ten million, two hundred sixteen thousand, five hundred".