21650649273 has 32 divisors (see below), whose sum is σ = 35513233920. Its totient is φ = 12925748880.

The previous prime is 21650649259. The next prime is 21650649323. The reversal of 21650649273 is 37294605612.

It is not a de Polignac number, because 21650649273 - 2²⁵ = 21617094841 is a prime.

It is a super-2 number, since 2×21650649273² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21650649203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524115 + ... + 563912.

It is an arithmetic number, because the mean of its divisors is an integer number (1109788560).

Almost surely, 2^21650649273 is an apocalyptic number.

It is an amenable number.

21650649273 is a deficient number, since it is larger than the sum of its proper divisors (13862584647).

21650649273 is a wasteful number, since it uses less digits than its factorization.

21650649273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088114 (or 1088108 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21650649273 in words is "twenty-one billion, six hundred fifty million, six hundred forty-nine thousand, two hundred seventy-three".