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21380910 = 235712697
BaseRepresentation
bin101000110001…
…1111100101110
31111020021002120
41101203330232
520433142120
62042133410
7346510005
oct121437456
944207076
1021380910
1111083881
1271b1266
134577b35
142ba7c3c
151d25140
hex1463f2e

21380910 has 16 divisors (see below), whose sum is σ = 51314256. Its totient is φ = 5701568.

The previous prime is 21380893. The next prime is 21380921. The reversal of 21380910 is 1908312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356319 + ... + 356378.

It is an arithmetic number, because the mean of its divisors is an integer number (3207141).

Almost surely, 221380910 is an apocalyptic number.

21380910 is an abundant number, since it is smaller than the sum of its proper divisors (29933346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21380910 is a wasteful number, since it uses less digits than its factorization.

21380910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712707.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21380910 is about 4623.9496104521. The cubic root of 21380910 is about 277.5505305272.

The spelling of 21380910 in words is "twenty-one million, three hundred eighty thousand, nine hundred ten".

Divisors: 1 2 3 5 6 10 15 30 712697 1425394 2138091 3563485 4276182 7126970 10690455 21380910