42421212401 has 4 divisors (see below), whose sum is σ = 42606458100. Its totient is φ = 42235966704.

The previous prime is 42421212373. The next prime is 42421212433. The reversal of 42421212401 is 10421212424.

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 39172326400 + 3248886001 = 197920^2 + 56999^2 .

It is a cyclic number.

It is not a de Polignac number, because 42421212401 - 2¹⁰ = 42421211377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42421212451) 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, 92622506 + ... + 92622963.

It is an arithmetic number, because the mean of its divisors is an integer number (10651614525).

Almost surely, 2^42421212401 is an apocalyptic number.

It is an amenable number.

42421212401 is a deficient number, since it is larger than the sum of its proper divisors (185245699).

42421212401 is a wasteful number, since it uses less digits than its factorization.

42421212401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185245698.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 42421212401 its sum of digits (23), we get a palindrome (42421212424).

Adding to 42421212401 its reverse (10421212424), we get a palindrome (52842424825).

The spelling of 42421212401 in words is "forty-two billion, four hundred twenty-one million, two hundred twelve thousand, four hundred one".