2155212520 has 16 divisors (see below), whose sum is σ = 4849228260. Its totient is φ = 862084992.

The previous prime is 2155212491. The next prime is 2155212547. The reversal of 2155212520 is 252125512.

2155212520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2052271204 + 102941316 = 45302^2 + 10146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26940117 + ... + 26940196.

Almost surely, 2^2155212520 is an apocalyptic number.

2155212520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155212520 is an abundant number, since it is smaller than the sum of its proper divisors (2694015740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155212520 is a wasteful number, since it uses less digits than its factorization.

2155212520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53880324 (or 53880320 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 2155212520 is about 46424.2664993212. The cubic root of 2155212520 is about 1291.7050785848.

The spelling of 2155212520 in words is "two billion, one hundred fifty-five million, two hundred twelve thousand, five hundred twenty".