1242523021440 has 128 divisors (see below), whose sum is σ = 3965158036800. Its totient is φ = 330953306112.

The previous prime is 1242523021409. The next prime is 1242523021543. The reversal of 1242523021440 is 441203252421.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1242523021398 and 1242523021407.

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, 1272594 + ... + 2025966.

Almost surely, 2^{1242523021440} is an apocalyptic number.

1242523021440 is a gapful number since it is divisible by the number (10) 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 1242523021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1982579018400).

1242523021440 is an abundant number, since it is smaller than the sum of its proper divisors (2722635015360).

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

1242523021440 is an equidigital number, since it uses as much as digits as its factorization.

1242523021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754254 (or 754242 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 1242523021440 its reverse (441203252421), we get a palindrome (1683726273861).

The spelling of 1242523021440 in words is "one trillion, two hundred forty-two billion, five hundred twenty-three million, twenty-one thousand, four hundred forty".