7215021216571 has 4 divisors (see below), whose sum is σ = 8245738533232. Its totient is φ = 6184303899912.

The previous prime is 7215021216547. The next prime is 7215021216589. The reversal of 7215021216571 is 1756121205127.

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

It is a cyclic number.

It is not a de Polignac number, because 7215021216571 - 2⁵ = 7215021216539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7215021216521) 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, 515358658320 + ... + 515358658333.

It is an arithmetic number, because the mean of its divisors is an integer number (2061434633308).

Almost surely, 2^{7215021216571} is an apocalyptic number.

7215021216571 is a deficient number, since it is larger than the sum of its proper divisors (1030717316661).

7215021216571 is a wasteful number, since it uses less digits than its factorization.

7215021216571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030717316660.

The product of its (nonzero) digits is 58800, while the sum is 40.

The spelling of 7215021216571 in words is "seven trillion, two hundred fifteen billion, twenty-one million, two hundred sixteen thousand, five hundred seventy-one".