7499000021 has 2 divisors, whose sum is σ = 7499000022. Its totient is φ = 7499000020.

The previous prime is 7498999987. The next prime is 7499000039. The reversal of 7499000021 is 1200009947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7312131121 + 186868900 = 85511^2 + 13670^2 .

It is a cyclic number.

It is not a de Polignac number, because 7499000021 - 2¹⁴ = 7498983637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7499000221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3749500010 + 3749500011.

It is an arithmetic number, because the mean of its divisors is an integer number (3749500011).

Almost surely, 2^7499000021 is an apocalyptic number.

It is an amenable number.

7499000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7499000021 is an equidigital number, since it uses as much as digits as its factorization.

7499000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 7499000021 is about 86596.7668045407. The cubic root of 7499000021 is about 1957.3468214860.

Adding to 7499000021 its reverse (1200009947), we get a palindrome (8699009968).

The spelling of 7499000021 in words is "seven billion, four hundred ninety-nine million, twenty-one", and thus it is an aban number.