21110052615 has 16 divisors (see below), whose sum is σ = 33786377088. Its totient is φ = 11255263776.

The previous prime is 21110052541. The next prime is 21110052629. The reversal of 21110052615 is 51625001112.

It is not a de Polignac number, because 21110052615 - 2¹⁰ = 21110051591 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163177 + ... + 262386.

It is an arithmetic number, because the mean of its divisors is an integer number (2111648568).

Almost surely, 2^21110052615 is an apocalyptic number.

21110052615 is a deficient number, since it is larger than the sum of its proper divisors (12676324473).

21110052615 is a wasteful number, since it uses less digits than its factorization.

21110052615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428878.

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 21110052615 its reverse (51625001112), we get a palindrome (72735053727).

The spelling of 21110052615 in words is "twenty-one billion, one hundred ten million, fifty-two thousand, six hundred fifteen".