1200221610 has 128 divisors (see below), whose sum is σ = 3381903360. Its totient is φ = 266920704.

The previous prime is 1200221597. The next prime is 1200221629. The reversal of 1200221610 is 161220021.

It is a super-2 number, since 2×1200221610² = 2881063826221984200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1200221610.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2733771 + ... + 2734209.

It is an arithmetic number, because the mean of its divisors is an integer number (26421120).

Almost surely, 2^1200221610 is an apocalyptic number.

1200221610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200221610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1690951680).

1200221610 is an abundant number, since it is smaller than the sum of its proper divisors (2181681750).

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

1200221610 is a wasteful number, since it uses less digits than its factorization.

1200221610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1200221610 is about 34644.2146685417. The cubic root of 1200221610 is about 1062.7239806466.

Adding to 1200221610 its reverse (161220021), we get a palindrome (1361441631).

The spelling of 1200221610 in words is "one billion, two hundred million, two hundred twenty-one thousand, six hundred ten".