21501141 has 16 divisors (see below), whose sum is σ = 31953600. Its totient is φ = 12780288.

The previous prime is 21501131. The next prime is 21501187. The reversal of 21501141 is 14110512.

It is a happy number.

It is not a de Polignac number, because 21501141 - 2¹³ = 21492949 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21501141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21501101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10126 + ... + 12063.

It is an arithmetic number, because the mean of its divisors is an integer number (1997100).

Almost surely, 2^21501141 is an apocalyptic number.

It is an amenable number.

21501141 is a deficient number, since it is larger than the sum of its proper divisors (10452459).

21501141 is a wasteful number, since it uses less digits than its factorization.

21501141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22228.

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

The square root of 21501141 is about 4636.9322833097. The cubic root of 21501141 is about 278.0698071854.

Adding to 21501141 its reverse (14110512), we get a palindrome (35611653).

The spelling of 21501141 in words is "twenty-one million, five hundred one thousand, one hundred forty-one".