21968654 has 8 divisors (see below), whose sum is σ = 33012408. Its totient is φ = 10964520.

The previous prime is 21968647. The next prime is 21968663. The reversal of 21968654 is 45686912.

It is a happy number.

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

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, 8477 + ... + 10760.

It is an arithmetic number, because the mean of its divisors is an integer number (4126551).

Almost surely, 2^21968654 is an apocalyptic number.

21968654 is a deficient number, since it is larger than the sum of its proper divisors (11043754).

21968654 is a wasteful number, since it uses less digits than its factorization.

21968654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19810.

The product of its digits is 103680, while the sum is 41.

The square root of 21968654 is about 4687.0730738916. The cubic root of 21968654 is about 280.0707899244.

It can be divided in two parts, 21968 and 654, that added together give a palindrome (22622).

The spelling of 21968654 in words is "twenty-one million, nine hundred sixty-eight thousand, six hundred fifty-four".