21650172093 has 24 divisors (see below), whose sum is σ = 34120216416. Its totient is φ = 13119472800.

The previous prime is 21650172091. The next prime is 21650172097. The reversal of 21650172093 is 39027105612.

It is not a de Polignac number, because 21650172093 - 2¹ = 21650172091 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650172091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1098738 + ... + 1118268.

It is an arithmetic number, because the mean of its divisors is an integer number (1421675684).

Almost surely, 2^21650172093 is an apocalyptic number.

It is an amenable number.

21650172093 is a deficient number, since it is larger than the sum of its proper divisors (12470044323).

21650172093 is a wasteful number, since it uses less digits than its factorization.

21650172093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30745 (or 30742 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 21650172093 in words is "twenty-one billion, six hundred fifty million, one hundred seventy-two thousand, ninety-three".