21266654 has 8 divisors (see below), whose sum is σ = 32578848. Its totient is φ = 10407040.

The previous prime is 21266633. The next prime is 21266669. The reversal of 21266654 is 45666212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21266654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113027 + ... + 113214.

It is an arithmetic number, because the mean of its divisors is an integer number (4072356).

Almost surely, 2^21266654 is an apocalyptic number.

21266654 is a deficient number, since it is larger than the sum of its proper divisors (11312194).

21266654 is a wasteful number, since it uses less digits than its factorization.

21266654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226290.

The product of its digits is 17280, while the sum is 32.

The square root of 21266654 is about 4611.5782547844. The cubic root of 21266654 is about 277.0552527419.

It can be divided in two parts, 212 and 66654, that added together give a palindrome (66866).

The spelling of 21266654 in words is "twenty-one million, two hundred sixty-six thousand, six hundred fifty-four".