21541270 has 8 divisors (see below), whose sum is σ = 38774304. Its totient is φ = 8616504.

The previous prime is 21541259. The next prime is 21541279. The reversal of 21541270 is 7214512.

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 not an unprimeable number, because it can be changed into a prime (21541279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077054 + ... + 1077073.

It is an arithmetic number, because the mean of its divisors is an integer number (4846788).

Almost surely, 2^21541270 is an apocalyptic number.

21541270 is a deficient number, since it is larger than the sum of its proper divisors (17233034).

21541270 is a wasteful number, since it uses less digits than its factorization.

21541270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154134.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21541270 is about 4641.2573727386. The cubic root of 21541270 is about 278.2426930248.

Adding to 21541270 its reverse (7214512), we get a palindrome (28755782).

The spelling of 21541270 in words is "twenty-one million, five hundred forty-one thousand, two hundred seventy".