2155213412 has 24 divisors (see below), whose sum is σ = 4192134912. Its totient is φ = 961157600.

The previous prime is 2155213393. The next prime is 2155213429. The reversal of 2155213412 is 2143125512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459764 + ... + 464427.

It is an arithmetic number, because the mean of its divisors is an integer number (174672288).

Almost surely, 2^2155213412 is an apocalyptic number.

2155213412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2155213412 is a deficient number, since it is larger than the sum of its proper divisors (2036921500).

2155213412 is a wasteful number, since it uses less digits than its factorization.

2155213412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924259 (or 924257 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 2155213412 is about 46424.2761063649. The cubic root of 2155213412 is about 1291.7052567886.

Adding to 2155213412 its reverse (2143125512), we get a palindrome (4298338924).

The spelling of 2155213412 in words is "two billion, one hundred fifty-five million, two hundred thirteen thousand, four hundred twelve".