1251023420000 has 60 divisors (see below), whose sum is σ = 3077705315916. Its totient is φ = 500409360000.

The previous prime is 1251023419991. The next prime is 1251023420011. The reversal of 1251023420000 is 243201521.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31255586 + ... + 31295585.

Almost surely, 2^{1251023420000} is an apocalyptic number.

1251023420000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251023420000 is an abundant number, since it is smaller than the sum of its proper divisors (1826681895916).

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

1251023420000 is an frugal number, since it uses more digits than its factorization.

1251023420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62551201 (or 62551178 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 1251023420000 its reverse (243201521), we get a palindrome (1251266621521).

The spelling of 1251023420000 in words is "one trillion, two hundred fifty-one billion, twenty-three million, four hundred twenty thousand".