21541101 has 8 divisors (see below), whose sum is σ = 28813344. Its totient is φ = 14314800.

The previous prime is 21541099. The next prime is 21541127. The reversal of 21541101 is 10114512.

It is a happy number.

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

It is not a de Polignac number, because 21541101 - 2¹ = 21541099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541301) 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, 10375 + ... + 12276.

It is an arithmetic number, because the mean of its divisors is an integer number (3601668).

Almost surely, 2^21541101 is an apocalyptic number.

It is an amenable number.

21541101 is a deficient number, since it is larger than the sum of its proper divisors (7272243).

21541101 is a wasteful number, since it uses less digits than its factorization.

21541101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22971.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 21541101 is about 4641.2391664296. The cubic root of 21541101 is about 278.2419653806.

Adding to 21541101 its reverse (10114512), we get a palindrome (31655613).

The spelling of 21541101 in words is "twenty-one million, five hundred forty-one thousand, one hundred one".