21919454 has 8 divisors (see below), whose sum is σ = 33248880. Its totient is φ = 10836496.

The previous prime is 21919441. The next prime is 21919459. The reversal of 21919454 is 45491912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61394 + ... + 61749.

It is an arithmetic number, because the mean of its divisors is an integer number (4156110).

Almost surely, 2^21919454 is an apocalyptic number.

21919454 is a deficient number, since it is larger than the sum of its proper divisors (11329426).

21919454 is a wasteful number, since it uses less digits than its factorization.

21919454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123234.

The product of its digits is 12960, while the sum is 35.

The square root of 21919454 is about 4681.8216540146. The cubic root of 21919454 is about 279.8615557080.

The spelling of 21919454 in words is "twenty-one million, nine hundred nineteen thousand, four hundred fifty-four".