1251421001244 has 48 divisors (see below), whose sum is σ = 3245331831840. Its totient is φ = 417023717760.

The previous prime is 1251421001239. The next prime is 1251421001279. The reversal of 1251421001244 is 4421001241521.

1251421001244 is a `hidden beast` number, since 1 + 2 + 514 + 2 + 100 + 1 + 2 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1231129 + ... + 2004624.

It is an arithmetic number, because the mean of its divisors is an integer number (67611079830).

Almost surely, 2^{1251421001244} is an apocalyptic number.

It is an amenable number.

1251421001244 is an abundant number, since it is smaller than the sum of its proper divisors (1993910830596).

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

1251421001244 is a wasteful number, since it uses less digits than its factorization.

1251421001244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239347 (or 3239339 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 1251421001244 its reverse (4421001241521), we get a palindrome (5672422242765).

The spelling of 1251421001244 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-one million, one thousand, two hundred forty-four".