2151215105 has 16 divisors (see below), whose sum is σ = 2943564624. Its totient is φ = 1495142400.

The previous prime is 2151215089. The next prime is 2151215141. The reversal of 2151215105 is 5015121512.

It can be written as a sum of positive squares in 8 ways, for example, as 399960001 + 1751255104 = 19999^2 + 41848^2 .

It is not a de Polignac number, because 2151215105 - 2⁴ = 2151215089 is a prime.

It is a super-2 number, since 2×2151215105² = 9255452855960322050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 972296 + ... + 974505.

It is an arithmetic number, because the mean of its divisors is an integer number (183972789).

Almost surely, 2^2151215105 is an apocalyptic number.

It is an amenable number.

2151215105 is a deficient number, since it is larger than the sum of its proper divisors (792349519).

2151215105 is a wasteful number, since it uses less digits than its factorization.

2151215105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946836.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 2151215105 is about 46381.1934408764. The cubic root of 2151215105 is about 1290.9059807616.

Adding to 2151215105 its reverse (5015121512), we get a palindrome (7166336617).

The spelling of 2151215105 in words is "two billion, one hundred fifty-one million, two hundred fifteen thousand, one hundred five".