1251321490512 has 120 divisors (see below), whose sum is σ = 3517182564480. Its totient is φ = 415295815680.

The previous prime is 1251321490493. The next prime is 1251321490537. The reversal of 1251321490512 is 2150941231521.

1251321490512 is a `hidden beast` number, since 1 + 2 + 5 + 132 + 1 + 4 + 9 + 0 + 512 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98842039 + ... + 98854697.

It is an arithmetic number, because the mean of its divisors is an integer number (29309854704).

Almost surely, 2^{1251321490512} is an apocalyptic number.

1251321490512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251321490512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1758591282240).

1251321490512 is an abundant number, since it is smaller than the sum of its proper divisors (2265861073968).

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

1251321490512 is a wasteful number, since it uses less digits than its factorization.

1251321490512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15601 (or 15592 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 1251321490512 in words is "one trillion, two hundred fifty-one billion, three hundred twenty-one million, four hundred ninety thousand, five hundred twelve".