7447822021 has 4 divisors (see below), whose sum is σ = 7704643500. Its totient is φ = 7191000544.

The previous prime is 7447821929. The next prime is 7447822037. The reversal of 7447822021 is 1202287447.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1202287447 = 17 ⋅70722791.

It can be written as a sum of positive squares in 2 ways, for example, as 1198128996 + 6249693025 = 34614^2 + 79055^2 .

It is not a de Polignac number, because 7447822021 - 2⁹ = 7447821509 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 (7447822121) 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, 128410696 + ... + 128410753.

It is an arithmetic number, because the mean of its divisors is an integer number (1926160875).

Almost surely, 2^7447822021 is an apocalyptic number.

It is an amenable number.

7447822021 is a deficient number, since it is larger than the sum of its proper divisors (256821479).

7447822021 is a wasteful number, since it uses less digits than its factorization.

7447822021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256821478.

The product of its (nonzero) digits is 50176, while the sum is 37.

The square root of 7447822021 is about 86300.7648923229. The cubic root of 7447822021 is about 1952.8839222022.

The spelling of 7447822021 in words is "seven billion, four hundred forty-seven million, eight hundred twenty-two thousand, twenty-one".