21234124015 has 16 divisors (see below), whose sum is σ = 27723927168. Its totient is φ = 15518923776.

The previous prime is 21234123961. The next prime is 21234124019. The reversal of 21234124015 is 51042143212.

It is a cyclic number.

It is not a de Polignac number, because 21234124015 - 2¹⁷ = 21233992943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234124019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1677607 + ... + 1690216.

It is an arithmetic number, because the mean of its divisors is an integer number (1732745448).

Almost surely, 2^21234124015 is an apocalyptic number.

21234124015 is a deficient number, since it is larger than the sum of its proper divisors (6489803153).

21234124015 is a wasteful number, since it uses less digits than its factorization.

21234124015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367938.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21234124015 its reverse (51042143212), we get a palindrome (72276267227).

The spelling of 21234124015 in words is "twenty-one billion, two hundred thirty-four million, one hundred twenty-four thousand, fifteen".