2155123330 has 8 divisors (see below), whose sum is σ = 3879222012. Its totient is φ = 862049328.

The previous prime is 2155123309. The next prime is 2155123331. The reversal of 2155123330 is 333215512.

It can be written as a sum of positive squares in 2 ways, for example, as 2104699129 + 50424201 = 45877^2 + 7101^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2155123295 and 2155123304.

It is not an unprimeable number, because it can be changed into a prime (2155123331) 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, 107756157 + ... + 107756176.

Almost surely, 2^2155123330 is an apocalyptic number.

2155123330 is a deficient number, since it is larger than the sum of its proper divisors (1724098682).

2155123330 is a wasteful number, since it uses less digits than its factorization.

2155123330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215512340.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 2155123330 is about 46423.3058926225. The cubic root of 2155123330 is about 1291.6872599607.

Adding to 2155123330 its reverse (333215512), we get a palindrome (2488338842).

The spelling of 2155123330 in words is "two billion, one hundred fifty-five million, one hundred twenty-three thousand, three hundred thirty".