21231154 has 16 divisors (see below), whose sum is σ = 36739008. Its totient is φ = 9013392.

The previous prime is 21231143. The next prime is 21231173. The reversal of 21231154 is 45113212.

It is an unprimeable number.

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, 5589 + ... + 8584.

It is an arithmetic number, because the mean of its divisors is an integer number (2296188).

Almost surely, 2^21231154 is an apocalyptic number.

21231154 is a deficient number, since it is larger than the sum of its proper divisors (15507854).

21231154 is a wasteful number, since it uses less digits than its factorization.

21231154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14289.

The product of its digits is 240, while the sum is 19.

The square root of 21231154 is about 4607.7276395204. The cubic root of 21231154 is about 276.9010059531.

Adding to 21231154 its reverse (45113212), we get a palindrome (66344366).

The spelling of 21231154 in words is "twenty-one million, two hundred thirty-one thousand, one hundred fifty-four".