7327021561 has 4 divisors (see below), whose sum is σ = 7331651712. Its totient is φ = 7322391412.

The previous prime is 7327021553. The next prime is 7327021579. The reversal of 7327021561 is 1651207237.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1651207237 = 23 ⋅71791619.

It is a cyclic number.

It is not a de Polignac number, because 7327021561 - 2³ = 7327021553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7327031561) 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, 2312701 + ... + 2315866.

It is an arithmetic number, because the mean of its divisors is an integer number (1832912928).

Almost surely, 2^7327021561 is an apocalyptic number.

It is an amenable number.

7327021561 is a deficient number, since it is larger than the sum of its proper divisors (4630151).

7327021561 is a wasteful number, since it uses less digits than its factorization.

7327021561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630150.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 7327021561 is about 85598.0231138547. The cubic root of 7327021561 is about 1942.2680068814.

Adding to 7327021561 its reverse (1651207237), we get a palindrome (8978228798).

The spelling of 7327021561 in words is "seven billion, three hundred twenty-seven million, twenty-one thousand, five hundred sixty-one".