21326154 has 8 divisors (see below), whose sum is σ = 42652320. Its totient is φ = 7108716.

The previous prime is 21326131. The next prime is 21326161. The reversal of 21326154 is 45162312.

It is a sphenic number, since it is the product of 3 distinct primes.

21326154 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1777174 + ... + 1777185.

It is an arithmetic number, because the mean of its divisors is an integer number (5331540).

Almost surely, 2^21326154 is an apocalyptic number.

21326154 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21326154 is a wasteful number, since it uses less digits than its factorization.

21326154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554364.

The product of its digits is 1440, while the sum is 24.

The square root of 21326154 is about 4618.0249024881. The cubic root of 21326154 is about 277.3133945514.

Adding to 21326154 its reverse (45162312), we get a palindrome (66488466).

The spelling of 21326154 in words is "twenty-one million, three hundred twenty-six thousand, one hundred fifty-four".