711872021 has 4 divisors (see below), whose sum is σ = 813568032. Its totient is φ = 610176012.

The previous prime is 711871939. The next prime is 711872023. The reversal of 711872021 is 120278117.

711872021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120278117 = 6469 ⋅18593.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-711872021 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 (711872023) 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, 50847995 + ... + 50848008.

It is an arithmetic number, because the mean of its divisors is an integer number (203392008).

Almost surely, 2^711872021 is an apocalyptic number.

It is an amenable number.

711872021 is a deficient number, since it is larger than the sum of its proper divisors (101696011).

711872021 is a wasteful number, since it uses less digits than its factorization.

711872021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101696010.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 711872021 is about 26680.9299125799. The cubic root of 711872021 is about 892.8955146365.

The spelling of 711872021 in words is "seven hundred eleven million, eight hundred seventy-two thousand, twenty-one".