2121234515 has 4 divisors (see below), whose sum is σ = 2545481424. Its totient is φ = 1696987608.

The previous prime is 2121234487. The next prime is 2121234541. The reversal of 2121234515 is 5154321212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121234515 - 2¹⁴ = 2121218131 is a prime.

It is a Duffinian number.

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, 212123447 + ... + 212123456.

It is an arithmetic number, because the mean of its divisors is an integer number (636370356).

Almost surely, 2^2121234515 is an apocalyptic number.

2121234515 is a deficient number, since it is larger than the sum of its proper divisors (424246909).

2121234515 is an equidigital number, since it uses as much as digits as its factorization.

2121234515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424246908.

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

The square root of 2121234515 is about 46056.8617580486. The cubic root of 2121234515 is about 1284.8809642090.

Adding to 2121234515 its reverse (5154321212), we get a palindrome (7275555727).

The spelling of 2121234515 in words is "two billion, one hundred twenty-one million, two hundred thirty-four thousand, five hundred fifteen".