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21552039 = 3217140863
BaseRepresentation
bin101001000110…
…1101110100111
31111112221211200
41102031232213
521004131124
62045533543
7351121635
oct122155647
944487750
1021552039
1111190403
1272742b3
1346079b2
142c10355
151d5abc9
hex148dba7

21552039 has 12 divisors (see below), whose sum is σ = 32962176. Its totient is φ = 13522752.

The previous prime is 21552031. The next prime is 21552043. The reversal of 21552039 is 93025512.

It is not a de Polignac number, because 21552039 - 23 = 21552031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70279 + ... + 70584.

It is an arithmetic number, because the mean of its divisors is an integer number (2746848).

Almost surely, 221552039 is an apocalyptic number.

21552039 is a deficient number, since it is larger than the sum of its proper divisors (11410137).

21552039 is a wasteful number, since it uses less digits than its factorization.

21552039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140886 (or 140883 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 21552039 is about 4642.4173659851. The cubic root of 21552039 is about 278.2890520429.

The spelling of 21552039 in words is "twenty-one million, five hundred fifty-two thousand, thirty-nine".

Divisors: 1 3 9 17 51 153 140863 422589 1267767 2394671 7184013 21552039