2155220530 has 16 divisors (see below), whose sum is σ = 3880488024. Its totient is φ = 861845760.

The previous prime is 2155220503. The next prime is 2155220531. The reversal of 2155220530 is 350225512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1261031121 + 894189409 = 35511^2 + 29903^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2155220495 and 2155220504.

It is not an unprimeable number, because it can be changed into a prime (2155220531) 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, 9520 + ... + 66340.

Almost surely, 2^2155220530 is an apocalyptic number.

2155220530 is a deficient number, since it is larger than the sum of its proper divisors (1725267494).

2155220530 is a wasteful number, since it uses less digits than its factorization.

2155220530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60621.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 2155220530 is about 46424.3527687786. The cubic root of 2155220530 is about 1291.7066788206.

The spelling of 2155220530 in words is "two billion, one hundred fifty-five million, two hundred twenty thousand, five hundred thirty".