7226666021 has 2 divisors, whose sum is σ = 7226666022. Its totient is φ = 7226666020.

The previous prime is 7226666003. The next prime is 7226666023. The reversal of 7226666021 is 1206666227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5153229796 + 2073436225 = 71786^2 + 45535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7226666021 is a prime.

Together with 7226666023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7226666023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3613333010 + 3613333011.

It is an arithmetic number, because the mean of its divisors is an integer number (3613333011).

Almost surely, 2^7226666021 is an apocalyptic number.

It is an amenable number.

7226666021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7226666021 is an equidigital number, since it uses as much as digits as its factorization.

7226666021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 7226666021 is about 85009.7995586391. The cubic root of 7226666021 is about 1933.3596989633.

The spelling of 7226666021 in words is "seven billion, two hundred twenty-six million, six hundred sixty-six thousand, twenty-one".