7021816 has 16 divisors (see below), whose sum is σ = 13940640. Its totient is φ = 3304320.

The previous prime is 7021789. The next prime is 7021843. The reversal of 7021816 is 6181207.

It is an interprime number because it is at equal distance from previous prime (7021789) and next prime (7021843).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25680 + ... + 25951.

It is an arithmetic number, because the mean of its divisors is an integer number (871290).

Almost surely, 2^7021816 is an apocalyptic number.

It is an amenable number.

7021816 is a deficient number, since it is larger than the sum of its proper divisors (6918824).

7021816 is a wasteful number, since it uses less digits than its factorization.

7021816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51654 (or 51650 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 7021816 is about 2649.8709402535. The cubic root of 7021816 is about 191.4916384081.

The spelling of 7021816 in words is "seven million, twenty-one thousand, eight hundred sixteen".