7042794821 has 4 divisors (see below), whose sum is σ = 7048583052. Its totient is φ = 7037006592.

The previous prime is 7042794791. The next prime is 7042794823. The reversal of 7042794821 is 1284972407.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 756525025 + 6286269796 = 27505^2 + 79286^2 .

It is a cyclic number.

It is not a de Polignac number, because 7042794821 - 2¹⁴ = 7042778437 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 (7042794823) 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, 2892290 + ... + 2894723.

It is an arithmetic number, because the mean of its divisors is an integer number (1762145763).

Almost surely, 2^7042794821 is an apocalyptic number.

It is an amenable number.

7042794821 is a deficient number, since it is larger than the sum of its proper divisors (5788231).

7042794821 is a wasteful number, since it uses less digits than its factorization.

7042794821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5788230.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 7042794821 is about 83921.3609339124. The cubic root of 7042794821 is about 1916.8215297412.

The spelling of 7042794821 in words is "seven billion, forty-two million, seven hundred ninety-four thousand, eight hundred twenty-one".