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21013624 = 232626703
BaseRepresentation
bin101000000101…
…0010001111000
31110112121021101
41100022101320
520334413444
62030221144
7343420132
oct120122170
943477241
1021013624
1110952935
1270547b4
1344798c8
142b10052
151ca13d4
hex140a478

21013624 has 8 divisors (see below), whose sum is σ = 39400560. Its totient is φ = 10506808.

The previous prime is 21013621. The next prime is 21013631. The reversal of 21013624 is 42631012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×210136242 = 883144787226752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313344 + ... + 1313359.

It is an arithmetic number, because the mean of its divisors is an integer number (4925070).

Almost surely, 221013624 is an apocalyptic number.

It is an amenable number.

21013624 is a deficient number, since it is larger than the sum of its proper divisors (18386936).

21013624 is a wasteful number, since it uses less digits than its factorization.

21013624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626709 (or 2626705 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21013624 is about 4584.0619542061. The cubic root of 21013624 is about 275.9520675706.

Adding to 21013624 its reverse (42631012), we get a palindrome (63644636).

The spelling of 21013624 in words is "twenty-one million, thirteen thousand, six hundred twenty-four".

Divisors: 1 2 4 8 2626703 5253406 10506812 21013624