7228699821 has 32 divisors (see below), whose sum is σ = 12243763200. Its totient is φ = 4129101360.

The previous prime is 7228699817. The next prime is 7228699837. The reversal of 7228699821 is 1289968227.

It is not a de Polignac number, because 7228699821 - 2² = 7228699817 is a prime.

It is a super-2 number, since 2×7228699821² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7228699801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 635260 + ... + 646538.

It is an arithmetic number, because the mean of its divisors is an integer number (382617600).

Almost surely, 2^7228699821 is an apocalyptic number.

It is an amenable number.

7228699821 is a deficient number, since it is larger than the sum of its proper divisors (5015063379).

7228699821 is a wasteful number, since it uses less digits than its factorization.

7228699821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14686 (or 14680 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 7228699821 is about 85021.7608674391. The cubic root of 7228699821 is about 1933.5410503701.

The spelling of 7228699821 in words is "seven billion, two hundred twenty-eight million, six hundred ninety-nine thousand, eight hundred twenty-one".