21894141 has 8 divisors (see below), whose sum is σ = 29743200. Its totient is φ = 14320592.

The previous prime is 21894109. The next prime is 21894149. The reversal of 21894141 is 14149812.

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

It is a cyclic number.

It is not a de Polignac number, because 21894141 - 2⁵ = 21894109 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21894099 and 21894108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68691 + ... + 69008.

It is an arithmetic number, because the mean of its divisors is an integer number (3717900).

Almost surely, 2^21894141 is an apocalyptic number.

It is an amenable number.

21894141 is a deficient number, since it is larger than the sum of its proper divisors (7849059).

21894141 is a wasteful number, since it uses less digits than its factorization.

21894141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137755.

The product of its digits is 2304, while the sum is 30.

The square root of 21894141 is about 4679.1175450078. The cubic root of 21894141 is about 279.7537844062.

The spelling of 21894141 in words is "twenty-one million, eight hundred ninety-four thousand, one hundred forty-one".