1251224512420 has 12 divisors (see below), whose sum is σ = 2627571476124. Its totient is φ = 500489804960.

The previous prime is 1251224512387. The next prime is 1251224512427. The reversal of 1251224512420 is 242154221521.

It can be written as a sum of positive squares in 2 ways, for example, as 491942320996 + 759282191424 = 701386^2 + 871368^2 .

It is not an unprimeable number, because it can be changed into a prime (1251224512427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31280612791 + ... + 31280612830.

It is an arithmetic number, because the mean of its divisors is an integer number (218964289677).

Almost surely, 2^{1251224512420} is an apocalyptic number.

1251224512420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251224512420 is an abundant number, since it is smaller than the sum of its proper divisors (1376346963704).

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

1251224512420 is a wasteful number, since it uses less digits than its factorization.

1251224512420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62561225630 (or 62561225628 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 1251224512420 its reverse (242154221521), we get a palindrome (1493378733941).

The spelling of 1251224512420 in words is "one trillion, two hundred fifty-one billion, two hundred twenty-four million, five hundred twelve thousand, four hundred twenty".