7216725621 has 16 divisors (see below), whose sum is σ = 11060486784. Its totient is φ = 4100003904.

The previous prime is 7216725619. The next prime is 7216725667. The reversal of 7216725621 is 1265276127.

It is not a de Polignac number, because 7216725621 - 2¹ = 7216725619 is a prime.

It is a super-2 number, since 2×7216725621² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7216725621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216725721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 989586 + ... + 996851.

It is an arithmetic number, because the mean of its divisors is an integer number (691280424).

Almost surely, 2^7216725621 is an apocalyptic number.

It is an amenable number.

7216725621 is a deficient number, since it is larger than the sum of its proper divisors (3843761163).

7216725621 is a wasteful number, since it uses less digits than its factorization.

7216725621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986620.

The product of its digits is 70560, while the sum is 39.

The square root of 7216725621 is about 84951.3132388193. The cubic root of 7216725621 is about 1932.4728360049.

The spelling of 7216725621 in words is "seven billion, two hundred sixteen million, seven hundred twenty-five thousand, six hundred twenty-one".