1210221440 has 64 divisors (see below), whose sum is σ = 2898126000. Its totient is φ = 483262464.

The previous prime is 1210221427. The next prime is 1210221499. The reversal of 1210221440 is 441220121.

It is a tau number, because it is divible by the number of its divisors (64).

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, 490931 + ... + 493389.

Almost surely, 2^1210221440 is an apocalyptic number.

1210221440 is a gapful number since it is divisible by the number (10) 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 1210221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1449063000).

1210221440 is an abundant number, since it is smaller than the sum of its proper divisors (1687904560).

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

1210221440 is an equidigital number, since it uses as much as digits as its factorization.

1210221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247 (or 3235 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1210221440 is about 34788.2370924426. The cubic root of 1210221440 is about 1065.6672374735.

Adding to 1210221440 its reverse (441220121), we get a palindrome (1651441561).

The spelling of 1210221440 in words is "one billion, two hundred ten million, two hundred twenty-one thousand, four hundred forty".