21635702850 has 24 divisors (see below), whose sum is σ = 53656543440. Its totient is φ = 5769520720.

The previous prime is 21635702849. The next prime is 21635702867. The reversal of 21635702850 is 5820753612.

It is a junction number, because it is equal to n+sod(n) for n = 21635702799 and 21635702808.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72118860 + ... + 72119159.

It is an arithmetic number, because the mean of its divisors is an integer number (2235689310).

Almost surely, 2^21635702850 is an apocalyptic number.

21635702850 is an abundant number, since it is smaller than the sum of its proper divisors (32020840590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21635702850 is a wasteful number, since it uses less digits than its factorization.

21635702850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144238034 (or 144238029 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 21635702850 in words is "twenty-one billion, six hundred thirty-five million, seven hundred two thousand, eight hundred fifty".