1251023351412 has 48 divisors (see below), whose sum is σ = 2921546880000. Its totient is φ = 416651891040.

The previous prime is 1251023351387. The next prime is 1251023351423. The reversal of 1251023351412 is 2141533201521.

It is a happy number.

It is a super-2 number, since 2×1251023351412² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1251023351412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83734639 + ... + 83749577.

It is an arithmetic number, because the mean of its divisors is an integer number (60865560000).

Almost surely, 2^{1251023351412} is an apocalyptic number.

1251023351412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1251023351412 is an abundant number, since it is smaller than the sum of its proper divisors (1670523528588).

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

1251023351412 is a wasteful number, since it uses less digits than its factorization.

1251023351412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20436 (or 20434 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 1251023351412 its reverse (2141533201521), we get a palindrome (3392556552933).

The spelling of 1251023351412 in words is "one trillion, two hundred fifty-one billion, twenty-three million, three hundred fifty-one thousand, four hundred twelve".