7021213893 has 20 divisors (see below), whose sum is σ = 10493078860. Its totient is φ = 4678756992.

The previous prime is 7021213889. The next prime is 7021213951. The reversal of 7021213893 is 3983121207.

It can be written as a sum of positive squares in 2 ways, for example, as 6740081604 + 281132289 = 82098^2 + 16767^2 .

It is not a de Polignac number, because 7021213893 - 2² = 7021213889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7021213813) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 179613 + ... + 215181.

It is an arithmetic number, because the mean of its divisors is an integer number (524653943).

Almost surely, 2^7021213893 is an apocalyptic number.

It is an amenable number.

7021213893 is a deficient number, since it is larger than the sum of its proper divisors (3471864967).

7021213893 is a wasteful number, since it uses less digits than its factorization.

7021213893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38018 (or 38009 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 7021213893 is about 83792.6840064215. The cubic root of 7021213893 is about 1914.8616490705.

The spelling of 7021213893 in words is "seven billion, twenty-one million, two hundred thirteen thousand, eight hundred ninety-three".