21850216869 has 16 divisors (see below), whose sum is σ = 31381164864. Its totient is φ = 13443504000.

The previous prime is 21850216849. The next prime is 21850216877. The reversal of 21850216869 is 96861205812.

It is not a de Polignac number, because 21850216869 - 2¹¹ = 21850214821 is a prime.

It is a super-2 number, since 2×21850216869² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850216819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141529 + ... + 252449.

It is an arithmetic number, because the mean of its divisors is an integer number (1961322804).

Almost surely, 2^21850216869 is an apocalyptic number.

It is an amenable number.

21850216869 is a deficient number, since it is larger than the sum of its proper divisors (9530947995).

21850216869 is a wasteful number, since it uses less digits than its factorization.

21850216869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115988.

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 21850216869 in words is "twenty-one billion, eight hundred fifty million, two hundred sixteen thousand, eight hundred sixty-nine".