42402004621 has 2 divisors, whose sum is σ = 42402004622. Its totient is φ = 42402004620.

The previous prime is 42402004613. The next prime is 42402004649. The reversal of 42402004621 is 12640020424.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37405494025 + 4996510596 = 193405^2 + 70686^2 .

It is a cyclic number.

It is not a de Polignac number, because 42402004621 - 2³ = 42402004613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42402004651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21201002310 + 21201002311.

It is an arithmetic number, because the mean of its divisors is an integer number (21201002311).

Almost surely, 2^42402004621 is an apocalyptic number.

It is an amenable number.

42402004621 is a deficient number, since it is larger than the sum of its proper divisors (1).

42402004621 is an equidigital number, since it uses as much as digits as its factorization.

42402004621 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 42402004621 in words is "forty-two billion, four hundred two million, four thousand, six hundred twenty-one".