8026020721 has 4 divisors (see below), whose sum is σ = 8127616000. Its totient is φ = 7924425444.

The previous prime is 8026020703. The next prime is 8026020727. The reversal of 8026020721 is 1270206208.

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.

It is a cyclic number.

It is not a de Polignac number, because 8026020721 - 2¹³ = 8026012529 is a prime.

It is a super-2 number, since 2×8026020721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8026020721.

It is not an unprimeable number, because it can be changed into a prime (8026020727) 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, 50797521 + ... + 50797678.

It is an arithmetic number, because the mean of its divisors is an integer number (2031904000).

Almost surely, 2^8026020721 is an apocalyptic number.

It is an amenable number.

8026020721 is a deficient number, since it is larger than the sum of its proper divisors (101595279).

8026020721 is a wasteful number, since it uses less digits than its factorization.

8026020721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101595278.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 8026020721 is about 89588.0612637644. The cubic root of 8026020721 is about 2002.1660466907.

Adding to 8026020721 its reverse (1270206208), we get a palindrome (9296226929).

The spelling of 8026020721 in words is "eight billion, twenty-six million, twenty thousand, seven hundred twenty-one".