1213250020 has 12 divisors (see below), whose sum is σ = 2547825084. Its totient is φ = 485300000.

The previous prime is 1213250011. The next prime is 1213250021. The reversal of 1213250020 is 200523121.

It can be written as a sum of positive squares in 2 ways, for example, as 348419556 + 864830464 = 18666^2 + 29408^2 .

It is a super-2 number, since 2×1213250020² = 2943951222060000800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213249976 and 1213250003.

It is not an unprimeable number, because it can be changed into a prime (1213250021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30331231 + ... + 30331270.

It is an arithmetic number, because the mean of its divisors is an integer number (212318757).

Almost surely, 2^1213250020 is an apocalyptic number.

1213250020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213250020 is an abundant number, since it is smaller than the sum of its proper divisors (1334575064).

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

1213250020 is a wasteful number, since it uses less digits than its factorization.

1213250020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60662510 (or 60662508 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1213250020 is about 34831.7386875820. The cubic root of 1213250020 is about 1066.5554413105. Note that the first 3 decimals are identical.

Adding to 1213250020 its reverse (200523121), we get a palindrome (1413773141).

The spelling of 1213250020 in words is "one billion, two hundred thirteen million, two hundred fifty thousand, twenty".