21650391154 has 16 divisors (see below), whose sum is σ = 37117137600. Its totient is φ = 9278193744.

The previous prime is 21650391143. The next prime is 21650391181. The reversal of 21650391154 is 45119305612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283257 + ... + 351475.

It is an arithmetic number, because the mean of its divisors is an integer number (2319821100).

Almost surely, 2^21650391154 is an apocalyptic number.

21650391154 is a deficient number, since it is larger than the sum of its proper divisors (15466746446).

21650391154 is a wasteful number, since it uses less digits than its factorization.

21650391154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90897.

The product of its (nonzero) digits is 32400, while the sum is 37.

Adding to 21650391154 its reverse (45119305612), we get a palindrome (66769696766).

The spelling of 21650391154 in words is "twenty-one billion, six hundred fifty million, three hundred ninety-one thousand, one hundred fifty-four".