1242342400021 has 16 divisors (see below), whose sum is σ = 1285200000000. Its totient is φ = 1199660716800.

The previous prime is 1242342400007. The next prime is 1242342400031. The reversal of 1242342400021 is 1200042432421.

It is not a de Polignac number, because 1242342400021 - 2⁵ = 1242342399989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242342400031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39740605 + ... + 39771853.

It is an arithmetic number, because the mean of its divisors is an integer number (80325000000).

Almost surely, 2^{1242342400021} is an apocalyptic number.

It is an amenable number.

1242342400021 is a deficient number, since it is larger than the sum of its proper divisors (42857599979).

1242342400021 is a wasteful number, since it uses less digits than its factorization.

1242342400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34020.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 1242342400021 its reverse (1200042432421), we get a palindrome (2442384832442).

The spelling of 1242342400021 in words is "one trillion, two hundred forty-two billion, three hundred forty-two million, four hundred thousand, twenty-one".