21605650235 has 32 divisors (see below), whose sum is σ = 28337480640. Its totient is φ = 15718348800.

The previous prime is 21605650223. The next prime is 21605650271. The reversal of 21605650235 is 53205650612.

It is not a de Polignac number, because 21605650235 - 2⁴ = 21605650219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21605650195 and 21605650204.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1618940 + ... + 1632230.

It is an arithmetic number, because the mean of its divisors is an integer number (885546270).

Almost surely, 2^21605650235 is an apocalyptic number.

21605650235 is a deficient number, since it is larger than the sum of its proper divisors (6731830405).

21605650235 is a wasteful number, since it uses less digits than its factorization.

21605650235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13679.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 21605650235 in words is "twenty-one billion, six hundred five million, six hundred fifty thousand, two hundred thirty-five".