42240021401 has 2 divisors, whose sum is σ = 42240021402. Its totient is φ = 42240021400.

The previous prime is 42240021379. The next prime is 42240021449. The reversal of 42240021401 is 10412004224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36925465600 + 5314555801 = 192160^2 + 72901^2 .

It is a cyclic number.

It is not a de Polignac number, because 42240021401 - 2²² = 42235827097 is a prime.

It is a super-3 number, since 3×42240021401³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (42240021451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120010700 + 21120010701.

It is an arithmetic number, because the mean of its divisors is an integer number (21120010701).

Almost surely, 2^42240021401 is an apocalyptic number.

It is an amenable number.

42240021401 is a deficient number, since it is larger than the sum of its proper divisors (1).

42240021401 is an equidigital number, since it uses as much as digits as its factorization.

42240021401 is an evil number, because the sum of its binary digits is even.

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

Adding to 42240021401 its reverse (10412004224), we get a palindrome (52652025625).

The spelling of 42240021401 in words is "forty-two billion, two hundred forty million, twenty-one thousand, four hundred one".