1220451012 has 108 divisors (see below), whose sum is σ = 3590669628. Its totient is φ = 348057600.

The previous prime is 1220450999. The next prime is 1220451053. The reversal of 1220451012 is 2101540221.

It can be written as a sum of positive squares in 2 ways, for example, as 728676036 + 491774976 = 26994^2 + 22176^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65812 + ... + 82292.

It is an arithmetic number, because the mean of its divisors is an integer number (33246941).

Almost surely, 2^1220451012 is an apocalyptic number.

1220451012 is a gapful number since it is divisible by the number (12) 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 1220451012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1795334814).

1220451012 is an abundant number, since it is smaller than the sum of its proper divisors (2370218616).

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

1220451012 is a wasteful number, since it uses less digits than its factorization.

1220451012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16530 (or 16514 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1220451012 is about 34934.9540145683. The cubic root of 1220451012 is about 1068.6613859842.

Adding to 1220451012 its reverse (2101540221), we get a palindrome (3321991233).

The spelling of 1220451012 in words is "one billion, two hundred twenty million, four hundred fifty-one thousand, twelve".