2155213332 has 60 divisors (see below), whose sum is σ = 5639647860. Its totient is φ = 717704064.

The previous prime is 2155213297. The next prime is 2155213337. The reversal of 2155213332 is 2333125512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1855369476 + 299843856 = 43074^2 + 17316^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 2155213296 and 2155213305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155213337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 411144 + ... + 416352.

It is an arithmetic number, because the mean of its divisors is an integer number (93994131).

Almost surely, 2^2155213332 is an apocalyptic number.

It is an amenable number.

2155213332 is an abundant number, since it is smaller than the sum of its proper divisors (3484434528).

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

2155213332 is a wasteful number, since it uses less digits than its factorization.

2155213332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6502 (or 6491 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 2155213332 is about 46424.2752447467. The cubic root of 2155213332 is about 1291.7052408062.

Adding to 2155213332 its reverse (2333125512), we get a palindrome (4488338844).

The spelling of 2155213332 in words is "two billion, one hundred fifty-five million, two hundred thirteen thousand, three hundred thirty-two".