6250000021 has 2 divisors, whose sum is σ = 6250000022. Its totient is φ = 6250000020.

The previous prime is 6249999971. The next prime is 6250000063. The reversal of 6250000021 is 1200000526.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6173244900 + 76755121 = 78570^2 + 8761^2 .

It is a cyclic number.

It is not a de Polignac number, because 6250000021 - 2¹⁹ = 6249475733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6250004021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3125000010 + 3125000011.

It is an arithmetic number, because the mean of its divisors is an integer number (3125000011).

Almost surely, 2^6250000021 is an apocalyptic number.

It is an amenable number.

6250000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6250000021 is an equidigital number, since it uses as much as digits as its factorization.

6250000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 6250000021 is about 79056.9416370251. The cubic root of 6250000021 is about 1842.0157513833.

Adding to 6250000021 its reverse (1200000526), we get a palindrome (7450000547).

The spelling of 6250000021 in words is "six billion, two hundred fifty million, twenty-one", and thus it is an aban number.