7170421321 has 6 divisors (see below), whose sum is σ = 8341102410. Its totient is φ = 6146075376.

The previous prime is 7170421319. The next prime is 7170421331. The reversal of 7170421321 is 1231240717.

It can be written as a sum of positive squares in only one way, i.e., 6284525625 + 885895696 = 79275^2 + 29764^2 .

It is not a de Polignac number, because 7170421321 - 2¹ = 7170421319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7170421321.

It is not an unprimeable number, because it can be changed into a prime (7170421331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73167516 + ... + 73167613.

It is an arithmetic number, because the mean of its divisors is an integer number (1390183735).

Almost surely, 2^7170421321 is an apocalyptic number.

It is an amenable number.

7170421321 is a deficient number, since it is larger than the sum of its proper divisors (1170681089).

7170421321 is a wasteful number, since it uses less digits than its factorization.

7170421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146335143 (or 146335136 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 7170421321 is about 84678.3403297443. The cubic root of 7170421321 is about 1928.3308898783.

It can be divided in two parts, 71704 and 21321, that added together give a square (93025 = 305²).

The spelling of 7170421321 in words is "seven billion, one hundred seventy million, four hundred twenty-one thousand, three hundred twenty-one".