21052311015 has 16 divisors (see below), whose sum is σ = 33727291488. Its totient is φ = 11213367936.

The previous prime is 21052310989. The next prime is 21052311103. The reversal of 21052311015 is 51011325012.

It is not a de Polignac number, because 21052311015 - 2⁷ = 21052310887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21052310982 and 21052311000.

It is a congruent number.

It is an unprimeable number.

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, 896224 + ... + 919413.

It is an arithmetic number, because the mean of its divisors is an integer number (2107955718).

Almost surely, 2^21052311015 is an apocalyptic number.

21052311015 is a deficient number, since it is larger than the sum of its proper divisors (12674980473).

21052311015 is a wasteful number, since it uses less digits than its factorization.

21052311015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816418.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 21052311015 its reverse (51011325012), we get a palindrome (72063636027).

The spelling of 21052311015 in words is "twenty-one billion, fifty-two million, three hundred eleven thousand, fifteen".