21996654 has 16 divisors (see below), whose sum is σ = 44341248. Its totient is φ = 7274232.

The previous prime is 21996649. The next prime is 21996673. The reversal of 21996654 is 45669912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13672 + ... + 15195.

It is an arithmetic number, because the mean of its divisors is an integer number (2771328).

Almost surely, 2^21996654 is an apocalyptic number.

21996654 is an abundant number, since it is smaller than the sum of its proper divisors (22344594).

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

21996654 is a wasteful number, since it uses less digits than its factorization.

21996654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28999.

The product of its digits is 116640, while the sum is 42.

The square root of 21996654 is about 4690.0590614618. The cubic root of 21996654 is about 280.1897268550.

The spelling of 21996654 in words is "twenty-one million, nine hundred ninety-six thousand, six hundred fifty-four".