1242506052421 has 4 divisors (see below), whose sum is σ = 1243843519500. Its totient is φ = 1241168585344.

The previous prime is 1242506052397. The next prime is 1242506052427.

1242506052421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172137861025 + 1070368191396 = 414895^2 + 1034586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242506052421 - 2¹⁵ = 1242506019653 is a prime.

It is a super-2 number, since 2×1242506052421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242506052427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668732146 + ... + 668734003.

It is an arithmetic number, because the mean of its divisors is an integer number (310960879875).

Almost surely, 2^{1242506052421} is an apocalyptic number.

It is an amenable number.

1242506052421 is a deficient number, since it is larger than the sum of its proper divisors (1337467079).

1242506052421 is an equidigital number, since it uses as much as digits as its factorization.

1242506052421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337467078.

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 1242506052421 in words is "one trillion, two hundred forty-two billion, five hundred six million, fifty-two thousand, four hundred twenty-one".