2157430073 has 8 divisors (see below), whose sum is σ = 2163822600. Its totient is φ = 2151047808.

The previous prime is 2157430063. The next prime is 2157430087. The reversal of 2157430073 is 3700347512.

It can be written as a sum of positive squares in 4 ways, for example, as 114661264 + 2042768809 = 10708^2 + 45197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2157430073 - 2¹⁴ = 2157413689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157430063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620183 + ... + 623651.

It is an arithmetic number, because the mean of its divisors is an integer number (270477825).

Almost surely, 2^2157430073 is an apocalyptic number.

It is an amenable number.

2157430073 is a deficient number, since it is larger than the sum of its proper divisors (6392527).

2157430073 is a wasteful number, since it uses less digits than its factorization.

2157430073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 2157430073 is about 46448.1439134009. The cubic root of 2157430073 is about 1292.1479494665.

Adding to 2157430073 its reverse (3700347512), we get a palindrome (5857777585).

The spelling of 2157430073 in words is "two billion, one hundred fifty-seven million, four hundred thirty thousand, seventy-three".