21234153015 has 24 divisors (see below), whose sum is σ = 36810953088. Its totient is φ = 11323316160.

The previous prime is 21234153007. The next prime is 21234153023. The reversal of 21234153015 is 51035143212.

21234153015 is a `hidden beast` number, since 2 + 12 + 341 + 5 + 301 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21234153007) and next prime (21234153023).

It is not a de Polignac number, because 21234153015 - 2³ = 21234153007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234153015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344445 + ... + 401385.

It is an arithmetic number, because the mean of its divisors is an integer number (1533789712).

Almost surely, 2^21234153015 is an apocalyptic number.

21234153015 is a deficient number, since it is larger than the sum of its proper divisors (15576800073).

21234153015 is a wasteful number, since it uses less digits than its factorization.

21234153015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65239 (or 65236 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21234153015 its reverse (51035143212), we get a palindrome (72269296227).

It can be divided in two parts, 212341 and 53015, that added together give a triangular number (265356 = T₇₂₈).

The spelling of 21234153015 in words is "twenty-one billion, two hundred thirty-four million, one hundred fifty-three thousand, fifteen".