1220210000 has 50 divisors (see below), whose sum is σ = 2954274642. Its totient is φ = 488080000.

The previous prime is 1220209999. The next prime is 1220210009. The reversal of 1220210000 is 120221.

It can be written as a sum of positive squares in 5 ways, for example, as 582546496 + 637663504 = 24136^2 + 25252^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a nialpdrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 1220210000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220210009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 51011 + ... + 71010.

Almost surely, 2^1220210000 is an apocalyptic number.

1220210000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220210000 is an abundant number, since it is smaller than the sum of its proper divisors (1734064642).

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

1220210000 is an equidigital number, since it uses as much as digits as its factorization.

1220210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122049 (or 122028 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1220210000 is about 34931.5044050496. The cubic root of 1220210000 is about 1068.5910357144.

Adding to 1220210000 its reverse (120221), we get a palindrome (1220330221).

The spelling of 1220210000 in words is "one billion, two hundred twenty million, two hundred ten thousand".