7408000021 has 2 divisors, whose sum is σ = 7408000022. Its totient is φ = 7408000020.

The previous prime is 7407999997. The next prime is 7408000031. The reversal of 7408000021 is 1200008047.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6851700625 + 556299396 = 82775^2 + 23586^2 .

It is a cyclic number.

It is not a de Polignac number, because 7408000021 - 2¹¹ = 7407997973 is a prime.

It is a super-2 number, since 2×7408000021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7407999956 and 7408000001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7408000031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3704000010 + 3704000011.

It is an arithmetic number, because the mean of its divisors is an integer number (3704000011).

Almost surely, 2^7408000021 is an apocalyptic number.

It is an amenable number.

7408000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7408000021 is an equidigital number, since it uses as much as digits as its factorization.

7408000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 7408000021 is about 86069.7392873941. The cubic root of 7408000021 is about 1949.3971418020.

Adding to 7408000021 its reverse (1200008047), we get a palindrome (8608008068).

The spelling of 7408000021 in words is "seven billion, four hundred eight million, twenty-one", and thus it is an aban number.