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21502041 = 3111494373
BaseRepresentation
bin101001000000…
…1100001011001
31111110102020220
41102001201121
521001031131
62044510253
7350523111
oct122014131
944412226
1021502041
1111156890
12724b389
1345bb002
142bda041
151d4ae96
hex1481859

21502041 has 16 divisors (see below), whose sum is σ = 31492800. Its totient is φ = 12941120.

The previous prime is 21502037. The next prime is 21502051. The reversal of 21502041 is 14020512.

It is a cyclic number.

It is not a de Polignac number, because 21502041 - 22 = 21502037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21502041.

It is not an unprimeable number, because it can be changed into a prime (21502001) 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, 2731 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (1968300).

Almost surely, 221502041 is an apocalyptic number.

It is an amenable number.

21502041 is a deficient number, since it is larger than the sum of its proper divisors (9990759).

21502041 is a wasteful number, since it uses less digits than its factorization.

21502041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21502041 is about 4637.0293292150. The cubic root of 21502041 is about 278.0736869692.

Adding to 21502041 its reverse (14020512), we get a palindrome (35522553).

The spelling of 21502041 in words is "twenty-one million, five hundred two thousand, forty-one".

Divisors: 1 3 11 33 149 447 1639 4373 4917 13119 48103 144309 651577 1954731 7167347 21502041