40013200421 has 2 divisors, whose sum is σ = 40013200422. Its totient is φ = 40013200420.

The previous prime is 40013200417. The next prime is 40013200427. The reversal of 40013200421 is 12400231004.

40013200421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38868122500 + 1145077921 = 197150^2 + 33839^2 .

It is a cyclic number.

It is not a de Polignac number, because 40013200421 - 2² = 40013200417 is a prime.

It is a super-2 number, since 2×40013200421² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40013200421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40013200427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20006600210 + 20006600211.

It is an arithmetic number, because the mean of its divisors is an integer number (20006600211).

Almost surely, 2^40013200421 is an apocalyptic number.

It is an amenable number.

40013200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40013200421 is an equidigital number, since it uses as much as digits as its factorization.

40013200421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 40013200421 its reverse (12400231004), we get a palindrome (52413431425).

The spelling of 40013200421 in words is "forty billion, thirteen million, two hundred thousand, four hundred twenty-one".