1210821696 has 280 divisors, whose sum is σ = 4176873536. Its totient is φ = 339655680.

The previous prime is 1210821641. The next prime is 1210821713. The reversal of 1210821696 is 6961280121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1210821696.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2213295 + ... + 2213841.

Almost surely, 2^1210821696 is an apocalyptic number.

1210821696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1210821696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088436768).

1210821696 is an abundant number, since it is smaller than the sum of its proper divisors (2966051840).

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

1210821696 is an equidigital number, since it uses as much as digits as its factorization.

1210821696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1210821696 is about 34796.8633069132. The cubic root of 1210821696 is about 1065.8433946088.

The spelling of 1210821696 in words is "one billion, two hundred ten million, eight hundred twenty-one thousand, six hundred ninety-six".