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21270190 = 253757487
BaseRepresentation
bin101000100100…
…0111010101110
31111000122012211
41101020322232
520421121230
62035521034
7345536134
oct121107256
944018184
1021270190
1111008677
12715917a
134539616
142b79754
151d0242a
hex1448eae

21270190 has 16 divisors (see below), whose sum is σ = 39321792. Its totient is φ = 8277984.

The previous prime is 21270187. The next prime is 21270191. The reversal of 21270190 is 9107212.

It is a super-2 number, since 2×212701902 = 904841965272200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28374 + ... + 29113.

It is an arithmetic number, because the mean of its divisors is an integer number (2457612).

Almost surely, 221270190 is an apocalyptic number.

21270190 is a deficient number, since it is larger than the sum of its proper divisors (18051602).

21270190 is a wasteful number, since it uses less digits than its factorization.

21270190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57531.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21270190 is about 4611.9616216963. The cubic root of 21270190 is about 277.0706071881.

The spelling of 21270190 in words is "twenty-one million, two hundred seventy thousand, one hundred ninety".

Divisors: 1 2 5 10 37 74 185 370 57487 114974 287435 574870 2127019 4254038 10635095 21270190