7021317959221 has 4 divisors (see below), whose sum is σ = 7021374892812. Its totient is φ = 7021261025632.

The previous prime is 7021317959209. The next prime is 7021317959233. The reversal of 7021317959221 is 1229597131207.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (7021317959209) and next prime (7021317959233).

It can be written as a sum of positive squares in 2 ways, for example, as 5544546158596 + 1476771800625 = 2354686^2 + 1215225^2 .

It is a cyclic number.

It is not a de Polignac number, because 7021317959221 - 2⁵ = 7021317959189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7021317959021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28281406 + ... + 28528591.

It is an arithmetic number, because the mean of its divisors is an integer number (1755343723203).

Almost surely, 2^{7021317959221} is an apocalyptic number.

It is an amenable number.

7021317959221 is a deficient number, since it is larger than the sum of its proper divisors (56933591).

7021317959221 is a wasteful number, since it uses less digits than its factorization.

7021317959221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56933590.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 7021317959221 in words is "seven trillion, twenty-one billion, three hundred seventeen million, nine hundred fifty-nine thousand, two hundred twenty-one".