21650154 has 16 divisors (see below), whose sum is σ = 43394400. Its totient is φ = 7201040.

The previous prime is 21650137. The next prime is 21650159. The reversal of 21650154 is 45105612.

It is not an unprimeable number, because it can be changed into a prime (21650159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (2712150).

Almost surely, 2^21650154 is an apocalyptic number.

21650154 is an abundant number, since it is smaller than the sum of its proper divisors (21744246).

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

21650154 is a wasteful number, since it uses less digits than its factorization.

21650154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7845.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 21650154 is about 4652.9725982430. The cubic root of 21650154 is about 278.7107136279.

Adding to 21650154 its reverse (45105612), we get a palindrome (66755766).

The spelling of 21650154 in words is "twenty-one million, six hundred fifty thousand, one hundred fifty-four".