21215304935 has 16 divisors (see below), whose sum is σ = 27943159680. Its totient is φ = 15334647840.

The previous prime is 21215304917. The next prime is 21215304947. The reversal of 21215304935 is 53940351212.

It is not a de Polignac number, because 21215304935 - 2¹⁸ = 21215042791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21215304895 and 21215304904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1174265 + ... + 1192194.

It is an arithmetic number, because the mean of its divisors is an integer number (1746447480).

Almost surely, 2^21215304935 is an apocalyptic number.

21215304935 is a deficient number, since it is larger than the sum of its proper divisors (6727854745).

21215304935 is a wasteful number, since it uses less digits than its factorization.

21215304935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366638.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 21215304935 in words is "twenty-one billion, two hundred fifteen million, three hundred four thousand, nine hundred thirty-five".