21310154 has 16 divisors (see below), whose sum is σ = 32762400. Its totient is φ = 10392624.

The previous prime is 21310147. The next prime is 21310181. The reversal of 21310154 is 45101312.

It is a zygodrome in base 3.

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 7 ways as a sum of consecutive naturals, for example, 13877 + ... + 15335.

It is an arithmetic number, because the mean of its divisors is an integer number (2047650).

Almost surely, 2^21310154 is an apocalyptic number.

21310154 is a deficient number, since it is larger than the sum of its proper divisors (11452246).

21310154 is a wasteful number, since it uses less digits than its factorization.

21310154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21310154 is about 4616.2922351168. The cubic root of 21310154 is about 277.2440255128.

Adding to 21310154 its reverse (45101312), we get a palindrome (66411466).

The spelling of 21310154 in words is "twenty-one million, three hundred ten thousand, one hundred fifty-four".