1240420421000 has 128 divisors (see below), whose sum is σ = 2956802940000. Its totient is φ = 486936576000.

The previous prime is 1240420420949. The next prime is 1240420421017. The reversal of 1240420421000 is 1240240421.

It can be written as a sum of positive squares in 16 ways, for example, as 94223213764 + 1146197207236 = 306958^2 + 1070606^2 .

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

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 31 ways as a sum of consecutive naturals, for example, 27366356 + ... + 27411644.

Almost surely, 2^{1240420421000} is an apocalyptic number.

1240420421000 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 1240420421000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1478401470000).

1240420421000 is an abundant number, since it is smaller than the sum of its proper divisors (1716382519000).

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

1240420421000 is a wasteful number, since it uses less digits than its factorization.

1240420421000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45820 (or 45806 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 1240420421000 its reverse (1240240421), we get a palindrome (1241660661421).

The spelling of 1240420421000 in words is "one trillion, two hundred forty billion, four hundred twenty million, four hundred twenty-one thousand".