21419654 has 4 divisors (see below), whose sum is σ = 32129484. Its totient is φ = 10709826.

The previous prime is 21419623. The next prime is 21419681. The reversal of 21419654 is 45691412.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21419654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5354912 + ... + 5354915.

It is an arithmetic number, because the mean of its divisors is an integer number (8032371).

Almost surely, 2^21419654 is an apocalyptic number.

21419654 is a deficient number, since it is larger than the sum of its proper divisors (10709830).

21419654 is a wasteful number, since it uses less digits than its factorization.

21419654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10709829.

The product of its digits is 8640, while the sum is 32.

The square root of 21419654 is about 4628.1372062634. The cubic root of 21419654 is about 277.7180776353.

The spelling of 21419654 in words is "twenty-one million, four hundred nineteen thousand, six hundred fifty-four".